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Dam,","shot_idx":218},{"idx":362,"start_s":1439.82,"end_s":1444.54,"text":"was built with funds advanced by the Metropolitan Water District of Southern California","shot_idx":218},{"idx":363,"start_s":1445.34,"end_s":1449.64,"text":"Parker Dam provides a forebay for the District's Colorado River Aqueduct.","shot_idx":219},{"idx":364,"start_s":1449.93,"end_s":1452.21,"text":"Another one of America's seven","shot_idx":220},{"idx":365,"start_s":1452.27,"end_s":1454.19,"text":"modern civil engineering wonders.","shot_idx":220},{"idx":366,"start_s":1455.18,"end_s":1458.24,"text":"Electrical energy from Parker and Hoover power plants.","shot_idx":221},{"idx":367,"start_s":1458.66,"end_s":1460.44,"text":"pumps water along the aqueduct.","shot_idx":222},{"idx":368,"start_s":1461.57,"end_s":1467.75,"text":"This waterway delivers municipal and industrial supplies to the Los Angeles and San Diego coastal areas.","shot_idx":222},{"idx":369,"start_s":1468.71,"end_s":1471.27,"text":"Parker Dam also controls floods.","shot_idx":222},{"idx":370,"start_s":1472.76,"end_s":1476.0,"text":"Below Parker Dam, Headgate Rock Dam.","shot_idx":222},{"idx":371,"start_s":1476.03,"end_s":1479.99,"text":"diverts water to Colorado River Indian Reservation lands in Arizona.","shot_idx":222},{"idx":372,"start_s":1481.28,"end_s":1483.02,"text":"and farther downstream","shot_idx":223},{"idx":373,"start_s":1483.41,"end_s":1488.07,"text":"The Palo Verde Diversion Dam sends water to the Palo Verde Irrigation District.","shot_idx":223},{"idx":374,"start_s":1488.57,"end_s":1491.39,"text":"oldest irrigation development on the Colorado River.","shot_idx":223},{"idx":375,"start_s":1492.41,"end_s":1495.63,"text":"At Imperial Dam and De-Silting Works","shot_idx":223},{"idx":376,"start_s":1495.68,"end_s":1498.48,"text":"300 miles downstream from Hoover Dam,","shot_idx":223},{"idx":377,"start_s":1499.15,"end_s":1502.19,"text":"Colorado River water enters river-sized canals","shot_idx":224},{"idx":378,"start_s":1502.61,"end_s":1506.07,"text":"to irrigate farmlands in California and Arizona.","shot_idx":224},{"idx":379,"start_s":1508.43,"end_s":1512.37,"text":"The All-American Canal system carries part of the Colorado's flow","shot_idx":224},{"idx":380,"start_s":1512.45,"end_s":1515.99,"text":"westward to the Yuma, Imperial, and Coachella valleys.","shot_idx":224},{"idx":381,"start_s":1517.76,"end_s":1521.3,"text":"When water reaches its farthest point on this canal system,","shot_idx":224},{"idx":382,"start_s":1521.72,"end_s":1525.86,"text":"It has traveled nearly 500 miles after leaving Hoover Dam","shot_idx":224},{"idx":383,"start_s":1526.82,"end_s":1529.26,"text":"and has required 10 days to make the trip.","shot_idx":225},{"idx":384,"start_s":1532.04,"end_s":1536.78,"text":"The Gila Gravity Main Canal takes water from Imperial Dam","shot_idx":225},{"idx":385,"start_s":1536.81,"end_s":1538.05,"text":"South and 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The narration describes the canyon's transformation from a desolate, sun-scorched place to a site of human engineering and tourism.","observations":{"place":{"name":"Black Canyon","evidence":"t:1:13","interior":false,"place_type":"other"},"events":[{"t":47,"kind":"spoken","text":"The canyon is described as scorched by a desert sun.","evidence":"t:0:47"},{"t":50,"kind":"spoken","text":"The river is described as angry and slashing toward the sea.","evidence":"t:0:50"},{"t":58,"kind":"spoken","text":"The dam is described as peaceful and silent except for the hum of the power plant.","evidence":"t:0:58"},{"t":60,"kind":"visible","text":"Water is shown bubbling up from turbines.","evidence":"frame:3"},{"t":74,"kind":"visible","text":"Tourists are shown walking across the dam structure.","evidence":"frame:4"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"adults and children in light summer clothing, some wearing hats"}],"period":null,"quotes":[{"t":"0:43","text":"This was a lonely canyon, unseen and untouched by man."},{"t":"0:50","text":"Scolded by an angry river slashing its way to the Mother Sea,"},{"t":"1:05","text":"the cheerful sounds of America and the world on the move."},{"t":"1:13","text":"Man built in Black Canyon."}],"objects":[{"name":"yellow speedboat on trailer","frame":1},{"name":"concrete dam structure","frame":3},{"name":"metal fence and walkway","frame":2},{"name":"tourists on dam walkway","frame":4}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"awe and pride in human engineering","themes":["human triumph over nature","tourism and infrastructure","reclamation projects"],"style_notes":"wide shots emphasize scale of dam and canyon; bright daylight lighting; static camera framing"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:51:10.541446+00:00","id":"gov.archives.arc.37058:b3:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=43","transcript_segments":[4,5,6,7,8,9,10,11,12,13],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":4,"start_s":79.27928,"end_s":97.96463,"first_shot":6,"last_shot":10,"sequence":3,"keyframes":[{"t":81.8,"shot":6},{"t":86.2,"shot":7},{"t":93.4,"shot":9},{"t":96.4,"shot":10}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.93,"rhythm":0.63,"visual":0.179,"pause_s":5.2},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A group of tourists is on a guided tour at Hoover Dam, standing on a ramp 560 feet below the dam's top, with a guide speaking about the location. The setting is Black Canyon, at the border of Nevada and Arizona, under bright daylight.","observations":{"place":{"value":"Hoover Dam powerhouse ramp","evidence":"t:1:27, frame:1, frame:2","interior":false,"place_type":"other"},"events":[{"t":80,"kind":"spoken","text":"A guide begins speaking to a group of tourists on the powerhouse ramp.","evidence":"t:1:26"},{"t":87,"kind":"spoken","text":"The guide states they are 560 feet below the top of the dam.","evidence":"t:1:30"},{"t":94,"kind":"spoken","text":"The guide identifies the location as Black Canyon, where Nevada and Arizona meet.","evidence":"t:1:34"},{"t":82,"kind":"visible","text":"Tourists walk along a concrete ramp next to the dam structure.","evidence":"frame:1"},{"t":96,"kind":"visible","text":"Tourists look upward at the dam wall, some pointing or shielding eyes from sun.","evidence":"frame:4"}],"people":[{"id":"p1","name":null,"presence":["visible","audible"],"appearance":"man in light blue uniform shirt and dark pants, wearing sunglasses, appears to be a guide or official"},{"id":"p2","name":null,"presence":["visible"],"appearance":"group of tourists, mostly middle-aged or older, wearing casual summer clothing, some with hats or sunglasses"}],"period":null,"quotes":[{"t":"1:26","text":"Ladies and gentlemen..."},{"t":"1:27","text":"We're now standing on the powerhouse ramp"},{"t":"1:30","text":"560 feet below the top of the dam."},{"t":"1:34","text":"This is Black Canyon."}],"objects":[{"name":"sign reading 'PLEASE WATCH YOUR STEP'","frame":2},{"name":"concrete dam wall with vertical buttresses","frame":3},{"name":"tourists carrying handbags and wearing hats","frame":1}],"time_of_day":"day","on_screen_text":null},"interpretations":{"mood":"informative and observational","themes":["public infrastructure","tourism","engineering achievement"],"style_notes":"wide-angle shots capturing scale of dam and crowd; bright daylight with high contrast; static camera framing group shots"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:51:17.982558+00:00","id":"gov.archives.arc.37058:b4:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=79","transcript_segments":[14,15,16,17,18,19,20],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":5,"start_s":97.96463,"end_s":138.40508,"first_shot":11,"last_shot":14,"sequence":4,"keyframes":[{"t":101.9,"shot":11},{"t":115.2,"shot":12},{"t":126.1,"shot":13},{"t":133.1,"shot":14}],"boundary":{"reason":"topic shift in dialogue","scores":{"ocr":0.0,"topic":0.93,"rhythm":0.4,"visual":0.314,"pause_s":0.4}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A group of people observes a dam site while a narrator describes the Colorado River's history and the human effort to control it. Maps illustrate the river's course and the surrounding geography.","observations":{"place":{"value":"dam_site","evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":102,"kind":"visible","text":"A man holds a megaphone while addressing a group of people at a dam site.","evidence":"frame:1"},{"t":115,"kind":"visible","text":"A map shows the Colorado River basin and surrounding states.","evidence":"frame:2"},{"t":126,"kind":"visible","text":"A close-up map highlights the course of the Colorado River through a canyon.","evidence":"frame:3"},{"t":133,"kind":"visible","text":"A map shows the Colorado River's path and its relation to the surrounding terrain.","evidence":"frame:4"},{"t":98,"kind":"spoken","text":"The narrator states that the Colorado River once flowed uncontrolled.","evidence":"t:1:38"},{"t":101,"kind":"spoken","text":"The narrator says man conquered the river by placing a concrete yoke about its neck.","evidence":"t:1:41"},{"t":106,"kind":"spoken","text":"The narrator explains the river's water and power resources are being harnessed.","evidence":"t:1:46"},{"t":110,"kind":"spoken","text":"The narrator describes the river gathering snow-fed rivulets from the Rockies.","evidence":"t:1:53"},{"t":118,"kind":"spoken","text":"The narrator mentions the river's 1400-mile descent to the Pacific Ocean.","evidence":"t:1:58"},{"t":124,"kind":"spoken","text":"The narrator states the river gouged great canyons and piled up deltas of silt.","evidence":"t:2:04"},{"t":131,"kind":"spoken","text":"The narrator says early settlers were at the mercy of the untamed river.","evidence":"t:2:11"},{"t":136,"kind":"spoken","text":"The narrator explains that melted snow caused the river to swell into a raging torrent each spring.","evidence":"t:2:16"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man holding megaphone, balding, wearing patterned shirt"},{"id":"p2","name":null,"presence":["visible"],"appearance":"person with dark hair, seen from behind, wearing white top"},{"id":"p3","name":null,"presence":["visible"],"appearance":"person with dark hair, seen from behind, wearing blue patterned top"}],"period":null,"quotes":[{"t":"1:41","text":"Here is where man conquered this mighty river."},{"t":"1:44","text":"placing a concrete yoke about his neck."},{"t":"1:53","text":"Through the ages, the river has gathered to its bed the snow-fed rivulets of the Rockies"},{"t":"2:11","text":"Early settlers were at the mercy of this untamed giant."}],"objects":[{"name":"megaphone","evidence":"frame:1"},{"name":"map of Colorado River basin","evidence":"frame:2"},{"name":"close-up map of Colorado River course","evidence":"frame:3"},{"name":"map showing river path and terrain","evidence":"frame:4"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"informative and reverent toward engineering achievement","themes":["human control over nature","geography and hydrology","historical engineering"],"style_notes":"mix of live-action shot of people at a dam site and illustrative maps; static camera on maps, medium shot on people; bright outdoor lighting"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:52:07.212788+00:00","id":"gov.archives.arc.37058:b5:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=97","transcript_segments":[21,22,23,24,25,26,27,28,29,30,31],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":6,"start_s":138.40508,"end_s":186.31966,"first_shot":15,"last_shot":18,"sequence":5,"keyframes":[{"t":139.3,"shot":15},{"t":155.0,"shot":16},{"t":173.2,"shot":17},{"t":181.5,"shot":18}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.93,"rhythm":0.09,"visual":0.224,"pause_s":6.0},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The frames show a river in winter with snow-covered banks and turbulent water, followed by a shot of hanging fruit and a windmill in a snowy landscape. The transcript describes historical flooding of the Colorado River, its destructive effects on farmlands and cities, and the subsequent drought that caused suffering for settlers and livestock.","observations":{"place":{"value":"riverbank","reason":null,"evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":139,"kind":"visible","text":"A river flows through a snow-covered landscape.","evidence":"frame:1"},{"t":155,"kind":"visible","text":"Turbulent, muddy water is shown in close-up.","evidence":"frame:2"},{"t":173,"kind":"visible","text":"Two round, frozen objects hang from bare tree branches.","evidence":"frame:3"},{"t":182,"kind":"visible","text":"A windmill stands in a snowy, wooded area.","evidence":"frame:4"},{"t":154,"kind":"spoken","text":"The Colorado River cut through its banks below the Mexican border in 1905 and poured into the Salton sink for two years.","evidence":"t:2:34"},{"t":171,"kind":"spoken","text":"After each spring's flood, the river dried to a trickle, causing crops to wither and livestock to thirst.","evidence":"t:2:46"},{"t":182,"kind":"spoken","text":"Settlers along the river were discouraged and aroused.","evidence":"t:3:02"}],"people":[],"period":null,"quotes":[{"t":"2:34","text":"In 1905, the Colorado cut through its banks below the Mexican border"},{"t":"2:40","text":"and for two years poured unchecked into the Salton sink, forming an inland sea."},{"t":"2:53","text":"Crops withered and died. Man and his livestock thirsted."},{"t":"3:02","text":"Settlers along the river were discouraged."}],"objects":[{"name":"river","evidence":"frame:1"},{"name":"snow","evidence":"frame:1"},{"name":"turbulent water","evidence":"frame:2"},{"name":"hanging fruit","evidence":"frame:3"},{"name":"windmill","evidence":"frame:4"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"desolate and destructive","themes":["natural disaster","human struggle against nature","environmental change"],"style_notes":"static shots, natural lighting, close-ups on water and snow, wide shot of windmill in landscape"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:52:07.216020+00:00","id":"gov.archives.arc.37058:b6:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=138","transcript_segments":[32,33,34,35,36,37,38,39,40,41,42,43,44],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":7,"start_s":186.31966,"end_s":194.62796,"first_shot":19,"last_shot":20,"sequence":6,"keyframes":[{"t":188.3,"shot":19},{"t":192.4,"shot":20}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.96,"rhythm":0.13,"visual":0.226,"pause_s":1.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows a dilapidated wooden structure in a dry, hilly landscape with sparse vegetation. The transcript mentions people giving up or staying to fight, and the need to regulate a river.","observations":{"place":{"value":"field","reason":null,"evidence":"frame:1","interior":false,"place_type":"field"},"events":[{"t":186,"kind":"spoken","text":"Some gave up and went elsewhere.","evidence":"t:3:06"},{"t":189,"kind":"spoken","text":"Others stayed to fight.","evidence":"t:3:09"},{"t":192,"kind":"spoken","text":"The river had to be regulated","evidence":"t:3:12"}],"people":[],"period":null,"quotes":[{"t":"3:06","text":"Some gave up and went elsewhere."},{"t":"3:09","text":"Others stayed to fight."},{"t":"3:12","text":"The river had to be regulated"}],"objects":[{"name":"wooden fence post with dry branches","frame":1},{"name":"dilapidated wooden building with corrugated roof","frame":2},{"name":"windmill in distant hills","frame":2}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"desolate","themes":["abandonment","struggle","environmental management"],"style_notes":"wide shots, natural lighting, static framing, emphasis on decay and landscape"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:52:41.677535+00:00","id":"gov.archives.arc.37058:b7:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=186","transcript_segments":[45,46,47],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":8,"start_s":194.62796,"end_s":227.52753,"first_shot":21,"last_shot":21,"sequence":7,"keyframes":[{"t":211.1,"shot":21}],"boundary":{"reason":"topic shift in dialogue","scores":{"ocr":0.0,"topic":0.96,"rhythm":0.06,"visual":0.36,"pause_s":0.3}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows a river flowing past rocks, with a voiceover discussing Arthur Powell Davis’s proposal to build a high dam to control floods and droughts, and Congress’s 1928 response. No people are visible; the scene is outdoors with natural lighting.","observations":{"place":{"value":"riverbank","evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":194,"kind":"spoken","text":"Arthur Powell Davis proposed building a high dam in a deep canyon to control the river.","evidence":"t:3:22"},{"t":203,"kind":"spoken","text":"Davis reported his findings and proposals to Congress in 1918.","evidence":"t:3:43"},{"t":207,"kind":"spoken","text":"Congress responded to Davis's proposal in 1928.","evidence":"t:3:47"}],"people":[],"period":null,"quotes":[{"t":"3:18","text":"No more floods."},{"t":"3:19","text":"No more droughts."},{"t":"3:22","text":"Arthur Powell Davis, first reclamation director and chief engineer, understood their problem.  For years he had traveled up and down the river"},{"t":"3:32","text":"Survey, study, build a high dam in a deep canyon upstream to control the river, he reasoned."}],"objects":[{"name":"river","evidence":"frame:1"},{"name":"rocks","evidence":"frame:1"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"expository and documentary","themes":["water management","engineering proposals","government response"],"style_notes":"static wide shot, natural lighting, no camera movement, focus on landscape"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:52:46.185985+00:00","id":"gov.archives.arc.37058:b8:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=194","transcript_segments":[48,49,50,51,52,53,54,55],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":9,"start_s":227.52753,"end_s":255.88922,"first_shot":22,"last_shot":25,"sequence":8,"keyframes":[{"t":228.1,"shot":22},{"t":229.9,"shot":23},{"t":233.6,"shot":24},{"t":245.9,"shot":25}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.94,"rhythm":0.25,"visual":0.396,"pause_s":3.2},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows a large assembly hall with many seated people and a speaker at a podium, followed by a close-up of a man signing documents. The transcript mentions Congress passing the Boulder Canyon Project Act in 1928 and President Hoover signing the appropriation bill in 1930.","observations":{"place":{"value":"courtroom","evidence":"frame:1","interior":true,"place_type":"courtroom"},"events":[{"t":228,"kind":"visible","text":"A man speaks at a podium in a large hall filled with seated men.","evidence":"frame:1"},{"t":246,"kind":"visible","text":"A man signs documents at a desk.","evidence":"frame:4"},{"t":230,"kind":"spoken","text":"Congress passed the Boulder Canyon Project Act in 1928 to authorize construction of Hoover Dam.","evidence":"t:3:49"},{"t":240,"kind":"spoken","text":"President Herbert Hoover signed the appropriation bill to begin construction in 1930.","evidence":"t:4:08"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man in dark suit, white shirt, seated at a podium, speaking"},{"id":"p2","name":{"value":"Herbert Hoover","evidence":"t:4:04"},"presence":["visible"],"appearance":"man in light suit, standing, signing papers"},{"id":"p3","name":null,"presence":["visible"],"appearance":"large group of men in suits, seated in rows"}],"period":null,"quotes":[{"t":"3:49","text":"passed the Boulder Canyon Project Act."},{"t":"3:52","text":"authorizing construction of Hoover Dam to control and regulate the Colorado River"},{"t":"4:04","text":"President Herbert Hoover"},{"t":"4:08","text":"signed the appropriation bill to begin construction."}],"objects":[{"name":"podium","frame":1},{"name":"documents","frame":4},{"name":"inkwell","frame":4},{"name":"microphone","frame":3}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"formal, official","themes":["government action","infrastructure","historical legislation"],"style_notes":"static wide shots of assembly, close-up on signing; high-contrast black-and-white film, formal attire"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:53:39.331757+00:00","id":"gov.archives.arc.37058:b9:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=227","transcript_segments":[55,56,57,58,59,60,61,62,63,64],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":10,"start_s":255.88922,"end_s":282.11545,"first_shot":26,"last_shot":31,"sequence":9,"keyframes":[{"t":259.1,"shot":26},{"t":267.9,"shot":28},{"t":271.8,"shot":29},{"t":279.8,"shot":31}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.93,"rhythm":0.52,"visual":0.248,"pause_s":6.0},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A group of men are shown on a boat on a river, followed by views of a canyon and a suspension bridge over water. The transcript mentions men, machines, and engineers working on a large dam project.","observations":{"place":{"value":"canyon","evidence":"frame:2, frame:3","interior":false,"place_type":"other"},"events":[{"t":261,"kind":"visible","text":"Men are on a boat moving across water.","evidence":"frame:1"},{"t":268,"kind":"visible","text":"A canyon with a river and a distant structure is shown.","evidence":"frame:2"},{"t":272,"kind":"visible","text":"A wide view of a canyon with a river is shown.","evidence":"frame:3"},{"t":280,"kind":"visible","text":"Men walk across a suspension bridge over water.","evidence":"frame:4"},{"t":261,"kind":"spoken","text":"Men and machines went to work to build this dam of unprecedented size.","evidence":"t:4:21"},{"t":266,"kind":"spoken","text":"this modern, Civil engineering wonder.","evidence":"t:4:26"},{"t":270,"kind":"spoken","text":"Reclamation engineers rushed to completion specifications and design drawings.","evidence":"t:4:30"},{"t":276,"kind":"spoken","text":"Crews at the dam site completed their surveys and investigations.","evidence":"t:4:36"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"group of men in dark clothing, visible on a boat and on a bridge"}],"period":null,"quotes":[{"t":"4:21","text":"Men and machines went to work to build this dam of unprecedented size."},{"t":"4:26","text":"this modern,"},{"t":"4:27","text":"Civil engineering wonder."},{"t":"4:30","text":"Reclamation engineers rushed to completion specifications and design drawings."}],"objects":[{"name":"boat","evidence":"frame:1"},{"name":"suspension bridge","evidence":"frame:4"},{"name":"canyon","evidence":"frame:2, frame:3"},{"name":"river","evidence":"frame:1, frame:2, frame:3, frame:4"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"documentary, informative","themes":["engineering","construction","nature"],"style_notes":"wide shots of landscape, static camera, natural lighting"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:53:48.357427+00:00","id":"gov.archives.arc.37058:b10:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=255","transcript_segments":[65,66,67,68,69],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":11,"start_s":282.11545,"end_s":308.14148,"first_shot":32,"last_shot":34,"sequence":9,"keyframes":[{"t":285.0,"shot":32},{"t":291.1,"shot":33},{"t":301.2,"shot":34}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.94,"rhythm":0.28,"visual":0.086,"pause_s":3.4}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The segment shows a river in a canyon with water being diverted through tunnels during dam construction. The transcript describes the scale of the tunnels and the effort to divert the Colorado River.","observations":{"place":{"value":"canyon","evidence":"frame:1, frame:3","interior":false,"place_type":"other"},"events":[{"t":282,"kind":"visible","text":"Water is shown rushing through a canyon during dam construction.","evidence":"frame:1"},{"t":291,"kind":"visible","text":"Water is seen violently churning, likely from diverted flow.","evidence":"frame:2"},{"t":301,"kind":"visible","text":"A wide view shows the river diverted through tunnels in canyon walls.","evidence":"frame:3"},{"t":283,"kind":"spoken","text":"The thunder of man's determination to conquer the Colorado reverberated between the sheer cliffs of Black Canyon as construction got underway.","evidence":"t:4:43"},{"t":293,"kind":"spoken","text":"The first major task was to divert the river around the dam site.","evidence":"t:4:53"},{"t":297,"kind":"spoken","text":"Four tunnels, two on each side, were drilled through the canyon walls, each 56 feet in diameter and averaging 4,000 feet in length.","evidence":"t:4:57"}],"people":[],"period":null,"quotes":[{"t":"4:43","text":"The thunder of man's determination to conquer the Colorado"},{"t":"4:47","text":"reverberated between the sheer cliffs of Black Canyon as construction got underway."},{"t":"4:53","text":"The first major task was to divert the river around the dam site."},{"t":"4:57","text":"To do this, four tunnels, two on each side, were drilled through the canyon walls. Each 56 feet in diameter, they averaged 4,000 feet in length."}],"objects":[{"name":"river","evidence":"frame:1, frame:3"},{"name":"canyon walls","evidence":"frame:1, frame:3"},{"name":"tunnels","evidence":"frame:3"},{"name":"rail tracks","evidence":"frame:3"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"epic, industrial","themes":["human engineering","conquest of nature","infrastructure"],"style_notes":"wide landscape shots, high-contrast lighting emphasizing scale and force of nature vs. engineering"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:54:21.354442+00:00","id":"gov.archives.arc.37058:b11:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=282","transcript_segments":[70,71,72,73],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":12,"start_s":308.14148,"end_s":320.5205,"first_shot":35,"last_shot":37,"sequence":9,"keyframes":[{"t":310.6,"shot":35},{"t":315.2,"shot":36},{"t":318.9,"shot":37}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.94,"rhythm":0.12,"visual":0.146,"pause_s":1.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Workers drill and blast rock in a tunnel, then load debris onto trucks that dump it in a gulch. A truck is shown exiting the tunnel mouth.","observations":{"place":{"value":"tunnel","evidence":"frame:1, frame:2, frame:3","interior":true,"place_type":"other"},"events":[{"t":308,"kind":"spoken","text":"Drill holes were packed with dynamite and blasted.","evidence":"t:5:08"},{"t":312,"kind":"spoken","text":"After each explosion, shovels and trucks entered the tunnels","evidence":"t:5:12"},{"t":315,"kind":"spoken","text":"mucked off the shattered rock.","evidence":"t:5:15"},{"t":317,"kind":"spoken","text":"and dumped it in nearby gulch.","evidence":"t:5:17"},{"t":311,"kind":"visible","text":"Workers operate drilling equipment inside a tunnel.","evidence":"frame:1"},{"t":315,"kind":"visible","text":"A truck dumps rock debris inside the tunnel.","evidence":"frame:2"},{"t":319,"kind":"visible","text":"A truck is parked at the mouth of the tunnel.","evidence":"frame:3"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"worker in hard hat, on scaffolding, operating drilling equipment"},{"id":"p2","name":null,"presence":["visible"],"appearance":"worker in hard hat, standing on platform near drilling rig"},{"id":"p3","name":null,"presence":["visible"],"appearance":"worker in hard hat, near truck in tunnel"}],"period":null,"quotes":[{"t":"5:08","text":"Drill holes were packed with dynamite and blasted."},{"t":"5:12","text":"After each explosion, shovels and trucks entered the tunnels"},{"t":"5:15","text":"mucked off the shattered rock."},{"t":"5:17","text":"and dumped it in nearby gulch."}],"objects":[{"name":"drilling rig","evidence":"frame:1"},{"name":"scaffolding","evidence":"frame:1"},{"name":"truck","evidence":"frame:2, frame:3"},{"name":"hard hats","evidence":"frame:1, frame:2, frame:3"},{"name":"tunnel entrance","evidence":"frame:3"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial, documentary","themes":["construction","manual labor","mining","engineering"],"style_notes":"static shots, high contrast black and white, medium to wide framing showing machinery and labor"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:54:36.570267+00:00","id":"gov.archives.arc.37058:b12:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=308","transcript_segments":[74,75,76,77],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":13,"start_s":320.5205,"end_s":338.4718,"first_shot":38,"last_shot":40,"sequence":9,"keyframes":[{"t":322.7,"shot":38},{"t":329.9,"shot":39},{"t":336.7,"shot":40}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.86,"rhythm":0.19,"visual":0.062,"pause_s":2.2}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A construction site shows dump trucks unloading rock material near tunnel entrances, with workers present. The transcript states that over 1.5 million cubic yards were excavated in 13 months and the tunnels were lined with three-foot-thick concrete.","observations":{"place":{"value":"construction site","evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":323,"kind":"visible","text":"Dump truck unloads material at construction site.","evidence":"frame:1"},{"t":330,"kind":"visible","text":"Two dump trucks dump rock material near tunnel entrance.","evidence":"frame:2"},{"t":337,"kind":"visible","text":"Worker walks near concrete forms and construction equipment.","evidence":"frame:3"},{"t":320,"kind":"spoken","text":"Workman excavated over one and a half million cubic yards of plaster rock material from the four tunnels in 13 months.","evidence":"t:5:20"},{"t":332,"kind":"spoken","text":"The tunnels then were lined with concrete three feet thick.","evidence":"t:5:32"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"worker in dark clothing, visible near truck"},{"id":"p2","name":null,"presence":["visible"],"appearance":"worker in light clothing, visible walking in frame 3"}],"period":null,"quotes":[{"t":"5:20","text":"Workman excavated over one and a half million cubic yards of plaster"},{"t":"5:25","text":"rock material from the four tunnels."},{"t":"5:27","text":"in 13 months."},{"t":"5:32","text":"The tunnels then were lined with"}],"objects":[{"name":"dump truck","frame":1},{"name":"dump trucks","frame":2},{"name":"concrete forms","frame":3},{"name":"construction workers","frame":1},{"name":"tunnel entrance","frame":2}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial, documentary","themes":["construction","engineering","labor"],"style_notes":"wide shots, static framing, natural daylight, grainy film quality"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:57:12.978246+00:00","id":"gov.archives.arc.37058:b13:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=320","transcript_segments":[78,79,80,81,82,83],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":14,"start_s":338.4718,"end_s":341.47482,"first_shot":41,"last_shot":41,"sequence":9,"keyframes":[{"t":340.0,"shot":41}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.84,"rhythm":0.3,"visual":0.12,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A single frame shows a shadowy figure on a textured surface near a window and a wheel-like object. No people are named, no dialogue is present, and the time of day or period is not established.","observations":{"place":{"value":"other","reason":"The scene shows a window and interior shadows, but the exact nature of the room or structure is unclear; no identifiable features like furniture or signage establish a specific place type.","evidence":"frame:1","interior":true,"place_type":"other"},"events":[],"people":[],"period":null,"quotes":[],"objects":[{"name":"shadowy figure","frame":1},{"name":"window","frame":1},{"name":"wheel-like object","frame":1},{"name":"textured surface","frame":1}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"ambiguous","themes":[],"style_notes":"high-contrast lighting creates strong shadows; tight framing on ground-level details; grainy, monochrome image quality"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:57:12.980659+00:00","id":"gov.archives.arc.37058:b14:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=338","transcript_segments":[],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":15,"start_s":341.47482,"end_s":369.0357,"first_shot":42,"last_shot":42,"sequence":10,"keyframes":[{"t":355.3,"shot":42}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.83,"rhythm":0.31,"visual":0.12,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A canyon is shown with explosions and debris, while the transcript describes daily blasts over two years and mentions high scalers preparing canyon walls. No named individuals appear, and the scene is outdoors in daylight.","observations":{"place":{"value":"canyon","evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":347,"kind":"spoken","text":"Explosions rocked the canyon almost daily for two years.","evidence":"t:5:47"},{"t":351,"kind":"spoken","text":"before actual placing of concrete in the dam began.","evidence":"t:5:51"},{"t":354,"kind":"spoken","text":"Oh, my God.","evidence":"t:5:54"},{"t":355,"kind":"spoken","text":"I'm going to go.","evidence":"t:5:55"},{"t":363,"kind":"spoken","text":"Acrobatic workmen called high scalers prepared the canyon walls for each blast.","evidence":"t:6:03"},{"t":355,"kind":"visible","text":"Explosions and debris are visible in the canyon.","evidence":"frame:1"}],"people":[],"period":null,"quotes":[{"t":"5:47","text":"Explosions rocked the canyon almost daily for two years."},{"t":"5:51","text":"before actual placing of concrete in the dam began."},{"t":"5:54","text":"Oh, my God."},{"t":"6:03","text":"Acrobatic workmen called high scalers prepared the canyon walls for each blast."}],"objects":[{"name":"explosions and debris","evidence":"frame:1"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"tense and dramatic","themes":["construction","danger","industrial labor"],"style_notes":"wide shot, high contrast from explosions, grainy film quality"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:57:32.692134+00:00","id":"gov.archives.arc.37058:b15:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=341","transcript_segments":[84,85,86,87,88],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":16,"start_s":369.0357,"end_s":387.0537,"first_shot":43,"last_shot":46,"sequence":11,"keyframes":[{"t":370.6,"shot":43},{"t":373.8,"shot":44},{"t":380.1,"shot":45},{"t":385.9,"shot":46}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.89,"rhythm":0.39,"visual":0.117,"pause_s":1.1}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Workers suspended on ropes drill into a rock face and clear debris after explosions. The transcript describes them as 'daredevils' who swarm over cliffs after each blast.","observations":{"place":{"value":"cliff","evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":369,"kind":"visible","text":"Workers are suspended on ropes drilling into rock.","evidence":"frame:1"},{"t":374,"kind":"visible","text":"Multiple workers are suspended on ropes against a cliff face.","evidence":"frame:2"},{"t":380,"kind":"visible","text":"Rock debris is visible falling or settled at the base of a cliff after an explosion.","evidence":"frame:3"},{"t":386,"kind":"visible","text":"Workers climb and clear debris from a rock face using ropes.","evidence":"frame:4"},{"t":369,"kind":"spoken","text":"The transcript states workers drilled holes in rock and loaded them with dynamite.","evidence":"t:6:09"},{"t":378,"kind":"spoken","text":"The transcript states after each explosion, workers swarmed over the cliffs.","evidence":"t:6:18"},{"t":382,"kind":"spoken","text":"The transcript states workers were prying loose rock.","evidence":"t:6:22"},{"t":384,"kind":"spoken","text":"The transcript states workers were clearing the walls of debris.","evidence":"t:6:24"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"wearing a light-colored shirt and dark pants, suspended on ropes against a rock face"},{"id":"p2","name":null,"presence":["visible"],"appearance":"multiple figures in dark clothing, suspended on ropes on a cliff face"},{"id":"p3","name":null,"presence":["visible"],"appearance":"figures in dark clothing, climbing or working on a steep rock face with ropes"}],"period":null,"quotes":[{"t":"6:09","text":"Suspended on ropes, they drilled holes in the rock and loaded them with dynamite."},{"t":"6:18","text":"After each explosion, these daredevils swarmed over the cliffs."},{"t":"6:22","text":"Prying loose rock"},{"t":"6:24","text":"and clearing the walls of debris."}],"objects":[{"name":"ropes","evidence":"frame:1"},{"name":"rock face","evidence":"frame:1"},{"name":"dynamite","evidence":"t:6:09"},{"name":"debris","evidence":"frame:3"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"tense and labor-intensive","themes":["manual labor","dangerous work","engineering"],"style_notes":"wide and medium shots showing scale of cliff and danger; high-contrast lighting emphasizes texture of rock and ropes"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:57:50.734739+00:00","id":"gov.archives.arc.37058:b16:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=369","transcript_segments":[89,90,91,92],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":17,"start_s":387.0537,"end_s":390.82416,"first_shot":47,"last_shot":47,"sequence":11,"keyframes":[{"t":388.9,"shot":47}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.96,"rhythm":0.47,"visual":0.048,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Two figures are climbing a rocky cliff using ropes. The scene is shot in a grainy, low-resolution style with muted colors.","observations":{"place":{"value":"cliff","evidence":"frame:1","interior":false,"place_type":"mountain"},"events":[{"t":389,"kind":"visible","text":"two climbers ascend a rocky cliff using ropes","evidence":"frame:1"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"climber in dark clothing, visible from side, using ropes"},{"id":"p2","name":null,"presence":["visible"],"appearance":"climber in dark clothing, visible from below, using ropes"}],"period":null,"quotes":[],"objects":[{"name":"ropes","evidence":"frame:1"},{"name":"rocky cliff","evidence":"frame:1"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"tense","themes":["adventure","physical exertion"],"style_notes":"grainy, low-resolution, muted color palette, static framing"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:57:50.737150+00:00","id":"gov.archives.arc.37058:b17:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=387","transcript_segments":[],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":18,"start_s":390.82416,"end_s":408.17484,"first_shot":48,"last_shot":52,"sequence":11,"keyframes":[{"t":393.1,"shot":48},{"t":396.4,"shot":49},{"t":402.1,"shot":51},{"t":406.4,"shot":52}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.96,"rhythm":0.11,"visual":0.059,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A person is shown on a rocky cliff face, followed by aerial views of a river diverted through a canyon and a construction site with smoke, ending with figures near rushing water under a structure. The transcript mentions the Colorado River being diverted under control for the first time in November 1932.","observations":{"place":{"value":"canyon","evidence":"frame:2","interior":false,"place_type":"other"},"events":[{"t":393,"kind":"visible","text":"A person is seen on a rocky cliff face.","evidence":"frame:1"},{"t":396,"kind":"visible","text":"An aerial view shows a river diverted through a canyon.","evidence":"frame:2"},{"t":402,"kind":"visible","text":"Smoke rises from a construction site viewed from above.","evidence":"frame:3"},{"t":406,"kind":"visible","text":"Figures are near rushing water under a large structure.","evidence":"frame:4"},{"t":395,"kind":"spoken","text":"The Colorado River was diverted under control for the first time in its history in November 1932.","evidence":"t:6:35"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"person in light shirt and hat, climbing or standing on rock face"},{"id":"p2","name":null,"presence":["visible"],"appearance":"figures in light clothing near water under structure"}],"period":null,"quotes":[{"t":"6:32","text":"Oh, my God."},{"t":"6:35","text":"In November 1932,"},{"t":"6:37","text":"The Colorado River was diverted"},{"t":"6:40","text":"under control for the first time in its history"}],"objects":[{"name":"rocky cliff face","frame":1},{"name":"river diverted through canyon","frame":2},{"name":"construction site with smoke","frame":3},{"name":"rushing water under structure","frame":4}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"documentary, observational","themes":["engineering","construction","natural forces"],"style_notes":"static shots, aerial views, high contrast black and white, grainy film"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:58:54.222591+00:00","id":"gov.archives.arc.37058:b18:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=390","transcript_segments":[93,94,95,96,97],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":19,"start_s":408.17484,"end_s":441.64163,"first_shot":53,"last_shot":58,"sequence":11,"keyframes":[{"t":411.1,"shot":53},{"t":425.8,"shot":55},{"t":428.4,"shot":56},{"t":439.5,"shot":58}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.9,"rhythm":0.25,"visual":0.121,"pause_s":1.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Men and trucks construct earthen coffer dams to divert a river and dry a construction site. Heavy machinery digs 135 feet below the old river level after the area is isolated by the dams.","observations":{"place":{"value":"construction_site","reason":null,"evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":408,"kind":"spoken","text":"Men and trucks dumped an earthen rock embankment across the canyon below the tunnel openings","evidence":"t:6:48"},{"t":414,"kind":"spoken","text":"forcing the river from its age old course through the huge diversion","evidence":"t:6:54"},{"t":420,"kind":"spoken","text":"A second earth and rock dam was thrown across the river above the tunnel outlets downstream","evidence":"t:7:00"},{"t":426,"kind":"spoken","text":"keeping water from backing into the foundation area","evidence":"t:7:06"},{"t":430,"kind":"spoken","text":"The site was pumped dry","evidence":"t:7:14"},{"t":432,"kind":"spoken","text":"Men and machines dug 135 feet below the old river level","evidence":"t:7:16"},{"t":411,"kind":"visible","text":"A dump truck unloads earth onto a construction site","evidence":"frame:1"},{"t":426,"kind":"visible","text":"A dump truck dumps earth into a canyon","evidence":"frame:2"},{"t":428,"kind":"visible","text":"A dump truck dumps earth into a canyon","evidence":"frame:3"},{"t":440,"kind":"visible","text":"A mechanical shovel scoops up earth","evidence":"frame:4"}],"people":[],"period":null,"quotes":[{"t":"6:48","text":"Men and trucks dumped an earthen rock embankment across the canyon below the tunnel openings"},{"t":"7:00","text":"A second earth and rock dam was thrown across the river above the tunnel outlets downstream"},{"t":"7:14","text":"The site was pumped dry."},{"t":"7:16","text":"Men and machines dug 135 feet below the old river level."}],"objects":[{"name":"dump truck","evidence":"frame:1"},{"name":"dump truck","evidence":"frame:2"},{"name":"dump truck","evidence":"frame:3"},{"name":"mechanical shovel","evidence":"frame:4"},{"name":"earth","evidence":"frame:2"},{"name":"canyon","evidence":"frame:2"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and documentary","themes":["engineering","construction","human control over nature"],"style_notes":"static shots, high-contrast black-and-white, wide framing to show scale of machinery and terrain"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:59:07.747327+00:00","id":"gov.archives.arc.37058:b19:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=408","transcript_segments":[98,99,100,101,102,103,104,105],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":20,"start_s":441.64163,"end_s":459.65967,"first_shot":59,"last_shot":60,"sequence":11,"keyframes":[{"t":442.9,"shot":59},{"t":451.9,"shot":60}],"boundary":{"reason":"topic shift in dialogue","scores":{"ocr":0.0,"topic":0.89,"rhythm":0.05,"visual":0.075,"pause_s":0.3}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Heavy machinery excavates rock and earth at a dam construction site, exposing the ancient riverbed. Geologists are mentioned as studying the site's geological history.","observations":{"place":{"value":"construction site","evidence":"frame:1, frame:2","interior":false,"place_type":"other"},"events":[{"t":443,"kind":"visible","text":"A large mechanical claw dumps material into a dump truck.","evidence":"frame:1"},{"t":452,"kind":"visible","text":"An aerial view shows a large excavation site with multiple vehicles and workers.","evidence":"frame:2"},{"t":441,"kind":"spoken","text":"The transcript mentions reaching bedrock for the dam's foundation.","evidence":"t:7:21"},{"t":444,"kind":"spoken","text":"The transcript mentions excavating over two million cubic yards of rock, earth and sand.","evidence":"t:7:24"},{"t":450,"kind":"spoken","text":"The transcript mentions cleanup exposing the ancient bed of the Colorado River.","evidence":"t:7:30"},{"t":455,"kind":"spoken","text":"The transcript mentions geologists reading the history of what happened ages ago.","evidence":"t:7:35"}],"people":[],"period":null,"quotes":[{"t":"7:21","text":"to reach bedrock for the dam's foundation."},{"t":"7:24","text":"excavating over two million cubic yards of rock"},{"t":"7:27","text":"earth and sand."},{"t":"7:30","text":"As cleanup of the dam site exposed the ancient bed of the Colorado River,"}],"objects":[{"name":"mechanical claw","evidence":"frame:1"},{"name":"dump truck","evidence":"frame:1"},{"name":"excavation site","evidence":"frame:2"},{"name":"construction vehicles","evidence":"frame:2"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and documentary","themes":["engineering","geology","construction"],"style_notes":"wide aerial shots and close-ups of machinery, high-contrast black and white footage"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:59:29.390381+00:00","id":"gov.archives.arc.37058:b20:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=441","transcript_segments":[106,107,108,109,110],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":21,"start_s":459.65967,"end_s":482.44913,"first_shot":61,"last_shot":66,"sequence":11,"keyframes":[{"t":461.3,"shot":61},{"t":468.6,"shot":63},{"t":474.3,"shot":64},{"t":480.8,"shot":66}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.89,"rhythm":0.24,"visual":0.056,"pause_s":1.4}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Workmen prepare bedrock for Hoover Dam's foundation while drag lines excavate sand and gravel from an old stream bed on the Arizona side. Heavy machinery, including a suspended bucket, is used in the excavation process.","observations":{"place":{"value":"construction site","evidence":"frame:2","interior":false,"place_type":"other"},"events":[{"t":460,"kind":"spoken","text":"Workmen cleaned and prepared bedrock surfaces to receive the first concrete","evidence":"t:7:40"},{"t":465,"kind":"spoken","text":"assuring utmost stability for Hoover Dam's foundation","evidence":"t:7:45"},{"t":470,"kind":"spoken","text":"drag lines, excavated sand and gravel for the dam's concrete","evidence":"t:7:52"},{"t":474,"kind":"spoken","text":"from an old stream bed deposit on the Arizona side","evidence":"t:7:57"},{"t":461,"kind":"visible","text":"man stands on rocky terrain holding tools","evidence":"frame:1"},{"t":469,"kind":"visible","text":"aerial view of canyon with road and excavation site","evidence":"frame:2"},{"t":474,"kind":"visible","text":"bucket suspended by chains over gravel","evidence":"frame:3"},{"t":481,"kind":"visible","text":"large bucket dumping material","evidence":"frame:4"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man wearing hard hat and work clothes, standing on rocky terrain with tools"}],"period":null,"quotes":[{"t":"7:40","text":"Workmen cleaned and prepared bedrock surfaces to receive the first concrete"},{"t":"7:45","text":"assuring utmost stability for Hoover Dam's foundation."},{"t":"7:52","text":"drag lines, excavated sand and gravel for the dam's concrete"},{"t":"7:57","text":"from an old stream bed deposit on the Arizona side"}],"objects":[{"name":"hard hat","frame":1},{"name":"tools","frame":1},{"name":"drag line bucket","frame":3},{"name":"chains","frame":3},{"name":"gravel","frame":3},{"name":"road","frame":2}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and documentary","themes":["engineering","construction labor","resource extraction"],"style_notes":"wide-angle shots of terrain, close-ups of machinery, high-contrast lighting emphasizing texture and scale"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 02:59:43.109802+00:00","id":"gov.archives.arc.37058:b21:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=459","transcript_segments":[111,112,113,114,115],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":22,"start_s":482.44913,"end_s":507.87454,"first_shot":67,"last_shot":78,"sequence":11,"keyframes":[{"t":483.5,"shot":67},{"t":495.3,"shot":71},{"t":500.7,"shot":74},{"t":507.3,"shot":78}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.89,"rhythm":0.17,"visual":0.148,"pause_s":3.1}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A train delivers raw material to an aggregate plant where it is processed through screening, grading, and washing before being stockpiled by size. The material is prepared for transport to a dam site.","observations":{"place":{"value":"aggregate plant","evidence":"frame:1","interior":false,"place_type":"factory"},"events":[{"t":483,"kind":"spoken","text":"A train hauls raw material to an aggregate plant across the river.","evidence":"t:8:03"},{"t":490,"kind":"spoken","text":"Sand and gravel pass through screening, grading, and washing.","evidence":"t:8:10"},{"t":496,"kind":"spoken","text":"The material emerges as unexcelled aggregate.","evidence":"t:8:16"},{"t":501,"kind":"spoken","text":"The aggregate is stockpiled according to sizes.","evidence":"t:8:21"},{"t":504,"kind":"spoken","text":"The stockpiled material awaits transport to the dam site.","evidence":"t:8:24"},{"t":484,"kind":"visible","text":"A steam locomotive is parked next to a crane at an industrial site.","evidence":"frame:1"},{"t":495,"kind":"visible","text":"A man stands on a conveyor belt structure next to a train.","evidence":"frame:2"},{"t":501,"kind":"visible","text":"Material is being processed in a hopper or chute.","evidence":"frame:3"},{"t":507,"kind":"visible","text":"Aggregate is being discharged from a rotating drum or screen.","evidence":"frame:4"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man wearing a hat and coat, standing on a conveyor structure"}],"period":null,"quotes":[{"t":"8:03","text":"A train hauled this raw material to an aggregate plant across the river, a few miles above the dam site."},{"t":"8:10","text":"Here the sand and gravel pass through various processes of screening, grading and washing"},{"t":"8:16","text":"until it emerged as unexcelled aggregate."},{"t":"8:21","text":"Then it was stockpiled according to sizes"}],"objects":[{"name":"steam locomotive","evidence":"frame:1"},{"name":"crane","evidence":"frame:1"},{"name":"conveyor belt","evidence":"frame:2"},{"name":"hopper or chute","evidence":"frame:3"},{"name":"rotating drum or screen","evidence":"frame:4"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and procedural","themes":["industrial processing","material handling","infrastructure construction"],"style_notes":"documentary-style shots with static framing, medium to close-up views of machinery and process, bright daylight lighting"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:00:05.146775+00:00","id":"gov.archives.arc.37058:b22:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=482","transcript_segments":[116,117,118,119,120],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":23,"start_s":507.87454,"end_s":532.89954,"first_shot":79,"last_shot":86,"sequence":11,"keyframes":[{"t":508.8,"shot":79},{"t":518.8,"shot":81},{"t":528.0,"shot":84},{"t":532.3,"shot":86}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.92,"rhythm":0.41,"visual":0.104,"pause_s":2.4}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The segment shows industrial machinery processing aggregate and mixing materials for concrete at a dam construction site, with narration describing the flow to mixing plants and the blending of sand, gravel, and cement. No people are clearly visible or named, and the setting is an outdoor industrial facility with heavy equipment.","observations":{"place":{"name":"industrial construction site","evidence":"frame:1, frame:2, frame:3, frame:4","interior":false,"place_type":"other"},"events":[{"t":508,"kind":"spoken","text":"Processed aggregate moves over the railroad to mixing plants.","evidence":"t:8:28"},{"t":519,"kind":"spoken","text":"Sand and gravel are blended with cement into a uniform mix.","evidence":"t:8:39"},{"t":528,"kind":"spoken","text":"The mix meets specifications for 4.5 million cubic yards of concrete for dam structures.","evidence":"t:8:44"},{"t":509,"kind":"visible","text":"Aggregate is dumped from a railcar onto a pile.","evidence":"frame:1"},{"t":519,"kind":"visible","text":"A large industrial structure with conveyors and a canyon in the background is shown.","evidence":"frame:2"},{"t":528,"kind":"visible","text":"A close-up of machinery with moving parts and structural beams is shown.","evidence":"frame:3"},{"t":532,"kind":"visible","text":"A person's hands operate valves and gauges on a control panel.","evidence":"frame:4"}],"people":[],"period":null,"quotes":[{"t":"8:28","text":"This processed aggregate moved as called for in a steady flow over the railroad"},{"t":"8:33","text":"to two mixing plants"},{"t":"8:39","text":"There, sand and gravel were blended with cement"},{"t":"8:44","text":"meeting rigid specifications for the 4.5 million cubic yards of concrete to be placed in the dam structures."}],"objects":[{"name":"railcar with 'UNION PACIFIC' text","evidence":"frame:1"},{"name":"conveyor belts and industrial structures","evidence":"frame:2"},{"name":"gauges and control valves","evidence":"frame:4"},{"name":"piles of aggregate","evidence":"frame:1"}],"time_of_day":null,"on_screen_text":"UNION PACIFIC"},"interpretations":{"mood":"industrial and documentary","themes":["industrial engineering","large-scale construction","material processing"],"style_notes":"static shots of machinery and infrastructure, high-contrast lighting emphasizing scale and mechanical detail"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:00:16.839321+00:00","id":"gov.archives.arc.37058:b23:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=507","transcript_segments":[121,122,123,124,125,126,127],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":24,"start_s":532.89954,"end_s":534.83484,"first_shot":87,"last_shot":87,"sequence":11,"keyframes":[{"t":533.9,"shot":87}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.94,"rhythm":0.08,"visual":0.074,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A close-up of a large, rusted industrial machine with visible gears and pipes, shown in a single frame. No people or spoken dialogue are present in this beat.","observations":{"place":{"value":"factory","evidence":"frame:1","interior":true,"place_type":"factory"},"events":[],"people":[],"period":null,"quotes":[],"objects":[{"name":"industrial machine","evidence":"frame:1","description":"large, rusted, with visible gears, pipes, and metal framework"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial, aged","themes":["industrial decay","mechanical complexity"],"style_notes":"close-up framing, monochrome or faded color, static shot emphasizing machinery detail"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:00:16.841795+00:00","id":"gov.archives.arc.37058:b24:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=532","transcript_segments":[],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":25,"start_s":534.83484,"end_s":535.9026,"first_shot":88,"last_shot":88,"sequence":12,"keyframes":[{"t":535.4,"shot":88}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.92,"rhythm":0.14,"visual":0.08,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A man in white overalls stands beside industrial machinery in a dimly lit interior space. No dialogue or on-screen text is present in this beat.","observations":{"place":{"value":"factory","evidence":"frame:1","interior":true,"place_type":"factory"},"events":[],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man wearing white overalls and a cap, medium build"}],"period":null,"quotes":[],"objects":[{"name":"industrial machinery with pipes and gauges","evidence":"frame:1"},{"name":"large circular gauges mounted on a frame","evidence":"frame:1"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial, functional","themes":["industrial labor","mechanization"],"style_notes":"static medium shot, monochrome, high contrast lighting emphasizing machinery"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:00:26.030132+00:00","id":"gov.archives.arc.37058:b25:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=534","transcript_segments":[],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":26,"start_s":535.9026,"end_s":538.9723,"first_shot":89,"last_shot":89,"sequence":13,"keyframes":[{"t":537.4,"shot":89}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.92,"rhythm":0.27,"visual":0.117,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A large industrial machine is shown in an interior setting with a person partially visible beside it. No dialogue or on-screen text is present in this beat.","observations":{"place":{"value":"factory","evidence":"frame:1","interior":true,"place_type":"factory"},"events":[],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"partial view of a person, possibly wearing work clothes, standing beside machinery"}],"period":null,"quotes":[],"objects":[{"name":"industrial machine","evidence":"frame:1","description":"large, metallic, with pipes and structural supports"},{"name":"person","evidence":"frame:1","description":"partially visible, standing near machine"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial, functional","themes":["industrial machinery","labor"],"style_notes":"static medium shot, high contrast lighting, grainy film texture"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:00:31.583060+00:00","id":"gov.archives.arc.37058:b26:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=535","transcript_segments":[],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":27,"start_s":538.9723,"end_s":559.0591,"first_shot":90,"last_shot":96,"sequence":14,"keyframes":[{"t":541.3,"shot":90},{"t":548.5,"shot":92},{"t":552.7,"shot":94},{"t":557.3,"shot":96}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.93,"rhythm":0.19,"visual":0.193,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Concrete is dispatched from mixing plants to a canyon construction site via aerial cableways, with the first bucket placed on June 6, 1933. The frames show industrial structures, cableway buckets, and the canyon terrain during this phase of Hoover Dam’s construction.","observations":{"place":{"value":"canyon","evidence":"frame:1, frame:2, frame:3, frame:4","interior":false,"place_type":"other"},"events":[{"t":541,"kind":"spoken","text":"Concrete is dispatched from mixing plants to construction points.","evidence":"t:9:01"},{"t":548,"kind":"spoken","text":"Nine aerial cableways span the canyon and lower concrete into forms.","evidence":"t:9:06"},{"t":553,"kind":"spoken","text":"The first bucket of concrete settled into its foundation on June 6, 1933.","evidence":"t:9:18"},{"t":557,"kind":"spoken","text":"Hoover Dam began its rise from the depths of Black Canyon.","evidence":"t:9:18"}],"people":[],"period":{"value":"1933","evidence":"t:9:18"},"quotes":[{"t":"9:01","text":"From the mixing plants,"},{"t":"9:02","text":"Concrete was dispatched to all points of construction."},{"t":"9:06","text":"Nine anchored aerial cableways spanning the canyon from rim to rim"},{"t":"9:18","text":"As the first bucket of concrete settled into its foundation on June 6, 1933, Hoover Dam began its rise from the depths of Black Canyon."}],"objects":[{"name":"concrete mixing plant","evidence":"frame:1"},{"name":"aerial cableway buckets","evidence":"frame:2, frame:3"},{"name":"canyon walls","evidence":"frame:1, frame:2, frame:3, frame:4"},{"name":"construction equipment","evidence":"frame:1, frame:3"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and monumental","themes":["large-scale construction","engineering achievement","industrial progress"],"style_notes":"wide-angle shots emphasizing scale, high-contrast monochrome, static framing to show engineering scope"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:01:06.997642+00:00","id":"gov.archives.arc.37058:b27:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=538","transcript_segments":[128,129,130,131,132,133],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":28,"start_s":559.0591,"end_s":587.95465,"first_shot":97,"last_shot":102,"sequence":14,"keyframes":[{"t":560.7,"shot":97},{"t":570.4,"shot":99},{"t":577.6,"shot":100},{"t":585.8,"shot":102}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.9,"rhythm":0.34,"visual":0.08,"pause_s":6.0},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Workers are shown at a large-scale dam construction site, pouring concrete into forms as the structure rises. The transcript describes the dam reaching 660 feet thick at its base and being built in five-foot layers.","observations":{"place":{"name":"dam construction site","evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":561,"kind":"visible","text":"Workers are visible around concrete forms at a dam site.","evidence":"frame:1"},{"t":570,"kind":"visible","text":"A cableway is shown dumping concrete into forms.","evidence":"frame:2"},{"t":578,"kind":"visible","text":"Concrete forms are arranged in stepped layers in a canyon.","evidence":"frame:3"},{"t":586,"kind":"visible","text":"The dam structure is shown rising with interlocking columns.","evidence":"frame:4"},{"t":569,"kind":"spoken","text":"Cableways dumped load after load of concrete into the forms. The dam soon reached its full 660 foot thickness at its base.","evidence":"t:9:29"},{"t":579,"kind":"spoken","text":"Poured in five foot layers of concrete.","evidence":"t:9:39"},{"t":582,"kind":"spoken","text":"The structure's keyed or interlocking columns climb skyward as crews set new records daily.","evidence":"t:9:42"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"workers in light-colored shirts and hats, visible in frame:1"}],"period":null,"quotes":[{"t":"9:29","text":"as cableways dumped load after load of concrete into the forms.  The dam soon reached its full 660 foot thickness at its base."},{"t":"9:39","text":"poured in five foot layers of concrete."},{"t":"9:42","text":"The structure's keyed or interlocking columns climb skyward as crews set new records daily."}],"objects":[{"name":"concrete forms","evidence":"frame:1"},{"name":"cableway","evidence":"frame:2"},{"name":"interlocking columns","evidence":"frame:4"},{"name":"hard hats","evidence":"frame:1"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and monumental","themes":["engineering achievement","labor","infrastructure"],"style_notes":"wide-angle shots emphasize scale; high-angle framing shows construction progress; monochrome film with high contrast"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:01:13.169094+00:00","id":"gov.archives.arc.37058:b28:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=559","transcript_segments":[134,135,136],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":29,"start_s":587.95465,"end_s":607.8745,"first_shot":103,"last_shot":105,"sequence":14,"keyframes":[{"t":592.4,"shot":103},{"t":597.8,"shot":104},{"t":603.3,"shot":105}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.87,"rhythm":0.01,"visual":0.113,"pause_s":6.0},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A large cylindrical container is transported via cable over a canyon and then emptied into a concrete form at a construction site. Workers are present near the form as the container is lowered and its contents dumped.","observations":{"place":{"value":"canyon","evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":592,"kind":"visible","text":"A large cylindrical container is suspended mid-air over a canyon by cables.","evidence":"frame:1"},{"t":598,"kind":"visible","text":"The container is shown in close-up, suspended against the sky, appearing to be in motion.","evidence":"frame:2"},{"t":603,"kind":"visible","text":"The container is lowered next to a concrete form; workers stand nearby as it is positioned for dumping.","evidence":"frame:3"},{"t":590,"kind":"spoken","text":"Bucketful after bucketful ran the continuous cycle.","evidence":"t:9:50"},{"t":594,"kind":"spoken","text":"Mixing plant to canyon rim, out into mid-air over the gorge,","evidence":"t:9:54"},{"t":598,"kind":"spoken","text":"and down into the forms.","evidence":"t:9:58"},{"t":600,"kind":"spoken","text":"dumping its load of 16 times.","evidence":"t:10:00"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man wearing light-colored shirt and dark pants, hard hat, standing near concrete form"},{"id":"p2","name":"null","presence":["visible"],"appearance":"man in light shirt and dark pants, partially visible behind p1"}],"period":null,"quotes":[{"t":"9:50","text":"Bucketful after bucketful ran the continuous cycle."},{"t":"9:54","text":"Mixing plant to canyon rim, out into mid-air over the gorge,"},{"t":"9:58","text":"and down into the forms."},{"t":"10:00","text":"dumping its load of 16 times."}],"objects":[{"name":"cylindrical container","frame":2},{"name":"cable system","frame":1},{"name":"concrete form","frame":3},{"name":"hard hat","frame":3},{"name":"shovel","frame":3}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial, methodical","themes":["construction","engineering","labor","industrial process"],"style_notes":"wide shot establishing scale, close-up on machinery, medium shot showing human interaction with equipment; high-contrast lighting typical of outdoor documentary footage"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:01:50.369170+00:00","id":"gov.archives.arc.37058:b29:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=587","transcript_segments":[137,138,139,140],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":30,"start_s":607.8745,"end_s":635.6023,"first_shot":106,"last_shot":112,"sequence":14,"keyframes":[{"t":609.0,"shot":106},{"t":614.3,"shot":108},{"t":629.1,"shot":110},{"t":634.9,"shot":112}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.9,"rhythm":0.07,"visual":0.065,"pause_s":1.4}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Workers are shown at a construction site handling concrete, with aerial and close-up shots of equipment and labor. The narration states that crews worked continuously through all seasons and conditions, and notes that one year had passed since the first concrete pour by June 1934.","observations":{"place":{"value":"construction_site","evidence":"frame:1, frame:4","interior":false,"place_type":"other"},"events":[{"t":609,"kind":"visible","text":"Workers are seen shoveling and handling wet concrete on the ground.","evidence":"frame:1"},{"t":614,"kind":"visible","text":"A hose and bucket are visible on the ground, part of the concrete delivery system.","evidence":"frame:2"},{"t":629,"kind":"visible","text":"An aerial view shows a large, grid-like structure being built with many workers present.","evidence":"frame:3"},{"t":635,"kind":"visible","text":"A large concrete bucket is suspended by a crane against a clear sky.","evidence":"frame:4"},{"t":608,"kind":"spoken","text":"Crews vibrated and compacted the fresh pores.","evidence":"t:10:08"},{"t":612,"kind":"spoken","text":"Buckets returned again and again to the mixing plants to be filled with more concrete.","evidence":"t:10:12"},{"t":621,"kind":"spoken","text":"Crews worked under all conditions, all seasons of the year without cessation.","evidence":"t:10:21"},{"t":630,"kind":"spoken","text":"By June 1934, one year after the first pour.","evidence":"t:10:30"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"men in light shirts and dark pants, working with shovels and hoses"}],"period":{"value":"1934","evidence":"t:10:30"},"quotes":[{"t":"10:08","text":"The crews vibrated and compacted the fresh pores"},{"t":"10:12","text":"while buckets returned again and again to the mixing plants."},{"t":"10:21","text":"Crews worked under all conditions, all seasons of the year without cessation."},{"t":"10:30","text":"By June 1934, One year after the first pour,"}],"objects":[{"name":"concrete bucket","frame":4},{"name":"hose","frame":2},{"name":"shovels","frame":1},{"name":"crane","frame":4},{"name":"concrete mixing plant","evidence":"t:10:12"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrious and relentless","themes":["labor","construction","perseverance","industrial progress"],"style_notes":"documentary-style shots with high-angle and close-up views; natural daylight; grainy film quality"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:02:03.202068+00:00","id":"gov.archives.arc.37058:b30:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=607","transcript_segments":[141,142,143,144,145,146,147,148,149],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":31,"start_s":635.6023,"end_s":665.26526,"first_shot":113,"last_shot":119,"sequence":14,"keyframes":[{"t":636.2,"shot":113},{"t":641.4,"shot":115},{"t":655.3,"shot":117},{"t":663.9,"shot":119}],"boundary":{"reason":"topic shift in dialogue","scores":{"ocr":0.0,"topic":0.96,"rhythm":0.01,"visual":0.063,"pause_s":0.7}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows construction of Hoover Dam and its associated power plant structures, with frames depicting concrete placement, intake towers, and the U-shaped power plant under construction. The transcript describes the dam's height, its status as a world wonder, and the building of related facilities at the toe of the dam.","observations":{"place":{"value":"construction site","reason":null,"evidence":"frame:1, frame:3, frame:4","interior":false,"place_type":"other"},"events":[{"t":636,"kind":"visible","text":"Concrete is being placed in forms at the dam site.","evidence":"frame:1"},{"t":641,"kind":"visible","text":"Aerial view shows the scale of the dam and canyon walls.","evidence":"frame:2"},{"t":655,"kind":"visible","text":"The U-shaped power plant is under construction with workers and equipment visible.","evidence":"frame:3"},{"t":664,"kind":"visible","text":"The interior of the power plant structure shows large columns and construction activity.","evidence":"frame:4"},{"t":635,"kind":"spoken","text":"Two-thirds of the dam's concrete had been placed in the forms.","evidence":"t:10:35"},{"t":642,"kind":"spoken","text":"Hoover Dam had risen to an impressive height and was becoming one of the world's wonders.","evidence":"t:10:42"},{"t":646,"kind":"spoken","text":"Related structures, including the power plant and intake towers, were taking form at the toe of the dam.","evidence":"t:10:46"},{"t":654,"kind":"spoken","text":"The power plant was built in twin wings along each side of the canyon walls.","evidence":"t:10:54"},{"t":659,"kind":"spoken","text":"Intake towers for the penstock system were being built with reinforcing steel and concrete.","evidence":"t:10:59"}],"people":[],"period":null,"quotes":[{"t":"10:35","text":"Two-thirds of the dam's concrete had been placed in the forms."},{"t":"10:42","text":"Already taking its place is one of the world's wonders."},{"t":"10:46","text":"As Hoover Dam climbed between its abutments,"},{"t":"10:54","text":"the U-shaped power plant to house generating equipment, control and maintenance facilities"}],"objects":[{"name":"concrete bucket","frame":1},{"name":"construction signage","frame":1},{"name":"intake towers","frame":2},{"name":"power plant structure","frame":3},{"name":"scaffolding and reinforcing steel","frame":4},{"name":"construction vehicles and workers","frame":3}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and monumental","themes":["engineering achievement","large-scale construction","industrial progress"],"style_notes":"wide-angle shots emphasize scale; high-contrast lighting highlights concrete and steel; aerial and ground-level views show progress"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:02:31.438107+00:00","id":"gov.archives.arc.37058:b31:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=635","transcript_segments":[150,151,152,153,154,155,156,157,158],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":32,"start_s":665.26526,"end_s":685.88586,"first_shot":120,"last_shot":125,"sequence":14,"keyframes":[{"t":667.4,"shot":120},{"t":675.6,"shot":122},{"t":678.7,"shot":123},{"t":683.7,"shot":125}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.95,"rhythm":0.23,"visual":0.094,"pause_s":6.0},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows construction of tall intake towers for a hydroelectric power plant, built into canyon walls with visible scaffolding and reinforcing steel. The transcript describes their height and placement relative to the dam and canyon rims.","observations":{"place":{"value":"canyon","evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":667,"kind":"visible","text":"Intake towers are shown under construction in a canyon.","evidence":"frame:1"},{"t":676,"kind":"visible","text":"Two tall, scaffolded towers are visible against canyon rock.","evidence":"frame:2"},{"t":679,"kind":"visible","text":"Workers are visible on scaffolding around the tower base.","evidence":"frame:3"},{"t":684,"kind":"visible","text":"A worker in a hard hat is seen near large pipes and rebar.","evidence":"frame:4"},{"t":664,"kind":"spoken","text":"The transcript describes intake towers for the power plant's penstock system, made of reinforcing steel and concrete.","evidence":"t:11:04"},{"t":674,"kind":"spoken","text":"The towers are described as perched on shelves hewn in the canyon walls.","evidence":"t:11:14"},{"t":677,"kind":"spoken","text":"The towers are said to rise 403 feet above the dam's crest.","evidence":"t:11:17"},{"t":681,"kind":"spoken","text":"The towers are described as rising well above the canyon rims.","evidence":"t:11:21"}],"people":[],"period":null,"quotes":[{"t":"11:04","text":"Intake towers, two on each side, for the power plant's penstock system, climbed as a maze of reinforcing steel and concrete."},{"t":"11:14","text":"perched on shelves hewn in the canyon walls"},{"t":"11:17","text":"These graceful columns rose 403 feet"},{"t":"11:21","text":"well above the dam's crest."}],"objects":[{"name":"intake towers","evidence":"frame:1"},{"name":"scaffolding","evidence":"frame:2"},{"name":"reinforcing steel","evidence":"frame:3"},{"name":"hard hat","evidence":"frame:4"},{"name":"large pipes","evidence":"frame:4"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and monumental","themes":["engineering scale","human construction in natural landscape","industrial progress"],"style_notes":"wide shots emphasize scale; high-angle views show integration with terrain; monochrome film with high contrast highlights structural detail"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:02:38.176588+00:00","id":"gov.archives.arc.37058:b32:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=665","transcript_segments":[158,159,160,161,162],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":33,"start_s":685.88586,"end_s":706.50653,"first_shot":126,"last_shot":129,"sequence":14,"keyframes":[{"t":688.6,"shot":126},{"t":693.8,"shot":127},{"t":698.5,"shot":128},{"t":703.7,"shot":129}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.92,"rhythm":0.21,"visual":0.1,"pause_s":1.2}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows aerial and ground views of large concrete spillways being constructed against canyon walls, with workers visible on scaffolding. A voiceover explains their function to bypass water and prevent the dam from being overtopped.","observations":{"place":{"value":"construction site","reason":null,"evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":686,"kind":"spoken","text":"The voiceover describes two giant spillways set against canyon walls to prevent water from overtopping the dam.","evidence":"t:11:26"},{"t":694,"kind":"visible","text":"Water is shown flowing into basins near the spillway structures.","evidence":"frame:2"},{"t":704,"kind":"visible","text":"Workers are visible on scaffolding around the concrete spillway structure.","evidence":"frame:4"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"workers in light-colored shirts and hats, visible on scaffolding and near concrete structures"}],"period":null,"quotes":[{"t":"11:26","text":"Two giant spillways were set against the canyon walls on each side of the reservoir just above the dam."},{"t":"11:32","text":"These high-level controls"},{"t":"11:34","text":"each capable of bypassing 200,000 cubic feet of water per second,"},{"t":"11:39","text":"Assure that no water will ever overtop the dam."}],"objects":[{"name":"concrete spillway structures","evidence":"frame:1"},{"name":"scaffolding","evidence":"frame:4"},{"name":"canyon walls","evidence":"frame:1"},{"name":"workers' hats and shirts","evidence":"frame:4"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"informative and technical","themes":["engineering","construction","water management"],"style_notes":"aerial and ground-level shots with high-angle framing; black-and-white footage with high contrast; documentary style emphasizing scale and engineering"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:03:00.749787+00:00","id":"gov.archives.arc.37058:b33:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=685","transcript_segments":[163,164,165,166,167],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":34,"start_s":706.50653,"end_s":741.8752,"first_shot":130,"last_shot":133,"sequence":14,"keyframes":[{"t":708.8,"shot":130},{"t":714.2,"shot":131},{"t":723.6,"shot":132},{"t":735.9,"shot":133}],"boundary":{"reason":"topic shift in dialogue","scores":{"ocr":0.0,"topic":0.94,"rhythm":0.21,"visual":0.083,"pause_s":0.3}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows exterior shots of Hoover Dam's spillway and penstock system, including large pipes and construction activity. A narrator describes the engineering specifications of the dam's components, such as drum gates and steel pipes, and mentions logistical challenges in transporting them.","observations":{"place":{"value":"Hoover Dam","evidence":"frame:1, frame:2, frame:3, frame:4","interior":false,"place_type":"other"},"events":[{"t":709,"kind":"visible","text":"Water flows through spillway tunnels at Hoover Dam.","evidence":"frame:1"},{"t":714,"kind":"visible","text":"Wide view of dam structure with spillway gates and bridge.","evidence":"frame:2"},{"t":724,"kind":"visible","text":"Large steel pipes stored near a building labeled 'THE BABCO'.","evidence":"frame:3"},{"t":736,"kind":"visible","text":"Worker in white suit suspended by ropes on curved metal surface.","evidence":"frame:4"},{"t":707,"kind":"spoken","text":"Narrator explains water plunges through spillway tunnels.","evidence":"t:11:46"},{"t":710,"kind":"spoken","text":"Narrator states water enters river below dam.","evidence":"t:11:49"},{"t":711,"kind":"spoken","text":"Narrator describes 100-foot drum gates rising during flood stage.","evidence":"t:11:51"},{"t":717,"kind":"spoken","text":"Narrator explains gates give reservoir 16 feet additional storage.","evidence":"t:11:57"},{"t":723,"kind":"spoken","text":"Narrator introduces Hoover Dam's penstock system.","evidence":"t:12:03"},{"t":726,"kind":"spoken","text":"Narrator states pipes required unprecedented size.","evidence":"t:12:06"},{"t":729,"kind":"spoken","text":"Narrator specifies pipe diameters from 8.5 to 30 feet.","evidence":"t:12:09"},{"t":733,"kind":"spoken","text":"Narrator mentions pipe thickness from 5/8 to 2.75 inches.","evidence":"t:12:15"},{"t":739,"kind":"spoken","text":"Narrator notes impossibility of shipping such large units across country.","evidence":"t:12:19"}],"people":[],"period":null,"quotes":[{"t":"11:46","text":"plunges downward through the spillway tunnels."},{"t":"11:51","text":"100 foot long drum gates on the spillway's crests"},{"t":"12:03","text":"Hoover Dam's Pennstock system."},{"t":"12:19","text":"As it was not possible to ship units of this size across country, steel plate"}],"objects":[{"name":"spillway tunnels","evidence":"frame:1"},{"name":"drum gates","evidence":"frame:1, frame:2"},{"name":"bridge over dam","evidence":"frame:2"},{"name":"large steel pipes","evidence":"frame:3"},{"name":"building with 'THE BABCO' sign","evidence":"frame:3"},{"name":"crane","evidence":"frame:3"},{"name":"worker in white suit","evidence":"frame:4"},{"name":"ropes and rigging","evidence":"frame:4"}],"time_of_day":null,"on_screen_text":"THE BABCO"},"interpretations":{"mood":"informative and technical","themes":["engineering scale","industrial construction","logistical challenges"],"style_notes":"static wide shots, documentary framing, high-contrast lighting on structures, no close-ups on people"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:03:33.602859+00:00","id":"gov.archives.arc.37058:b34:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=706","transcript_segments":[168,169,170,171,172,173,174,175,176,177,178],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":35,"start_s":741.8752,"end_s":768.26825,"first_shot":134,"last_shot":138,"sequence":14,"keyframes":[{"t":743.5,"shot":134},{"t":750.3,"shot":135},{"t":762.1,"shot":137},{"t":766.3,"shot":138}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.87,"rhythm":0.22,"visual":0.105,"pause_s":6.0},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows industrial scenes of large steel pipe sections being fabricated and handled at a construction site near a dam, with workers and machinery visible. The transcript explains the pipes were made for the Hoover Dam project and required special equipment.","observations":{"place":{"value":"factory","reason":null,"evidence":"frame:1, frame:2, frame:3, frame:4","interior":false,"place_type":"factory"},"events":[{"t":744,"kind":"visible","text":"A crane lifts a large steel pipe section at an outdoor fabrication site.","evidence":"frame:1"},{"t":750,"kind":"visible","text":"Workers move around large pipe sections inside a factory building.","evidence":"frame:2"},{"t":762,"kind":"visible","text":"A man in a hat works on a pipe section on a workbench.","evidence":"frame:3"},{"t":766,"kind":"visible","text":"Workers install or adjust a large curved pipe section using scaffolding and rigging.","evidence":"frame:4"},{"t":745,"kind":"spoken","text":"The pipe was brought from Eastern Rolling Mills, a steel fabrication plant.","evidence":"t:12:25"},{"t":750,"kind":"spoken","text":"The plant was erected especially for the job near the dam site.","evidence":"t:12:30"},{"t":753,"kind":"spoken","text":"The plant rolled and assembled nearly three miles of pipe installed in canyon wall tunnels.","evidence":"t:12:33"},{"t":759,"kind":"spoken","text":"Fabrication of the pipe sections required special machinery and equipment.","evidence":"t:12:43"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man in light shirt and hat, working on pipe section"},{"id":"p2","name":null,"presence":["visible"],"appearance":"workers in dark clothing, visible in background or on scaffolding"}],"period":null,"quotes":[{"t":"12:25","text":"was brought from Eastern Rolling Mills."},{"t":"12:27","text":"a steel fabrication plant"},{"t":"12:33","text":"rolled and assembled the nearly three miles of pipe"},{"t":"12:43","text":"Fabrication of the pipe sections required special machinery and equipment."}],"objects":[{"name":"large steel pipe sections","frame":1},{"name":"crane","frame":1},{"name":"factory building","frame":2},{"name":"workbench","frame":3},{"name":"scaffolding and rigging","frame":4}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and documentary","themes":["industrial engineering","large-scale construction","labor and machinery"],"style_notes":"static wide shots, high-contrast lighting, grainy film stock, focused on machinery and scale of construction"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:03:44.179840+00:00","id":"gov.archives.arc.37058:b35:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=741","transcript_segments":[179,180,181,182,183,184,185],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":36,"start_s":768.26825,"end_s":795.56226,"first_shot":139,"last_shot":144,"sequence":14,"keyframes":[{"t":771.5,"shot":139},{"t":783.6,"shot":141},{"t":786.8,"shot":142},{"t":793.9,"shot":144}],"boundary":{"reason":"topic shift in dialogue","scores":{"ocr":0.0,"topic":0.91,"rhythm":0.05,"visual":0.09,"pause_s":0.9}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Workers operate heavy machinery to shape, bend, and roll large metal plates into massive cylindrical pipe sections inside a factory. The transcript explains that three such plates form a ring 30 feet in diameter and 11 feet long.","observations":{"place":{"value":"factory","evidence":"frame:1","interior":true,"place_type":"factory"},"events":[{"t":772,"kind":"visible","text":"A worker operates a planing machine on a large metal plate.","evidence":"frame:1"},{"t":784,"kind":"visible","text":"A worker welds or works near a large cylindrical metal section.","evidence":"frame:2"},{"t":787,"kind":"visible","text":"A large metal cylinder is shown in a factory setting with workers nearby.","evidence":"frame:3"},{"t":794,"kind":"visible","text":"Massive cylindrical pipe sections are shown in a factory, with workers present.","evidence":"frame:4"},{"t":768,"kind":"spoken","text":"The edges of dimension plates were shaped on a planing machine for precision.","evidence":"t:12:48"},{"t":796,"kind":"spoken","text":"Three large curved plates welded together form a ring 30 feet in diameter and 11 feet long.","evidence":"t:13:11"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man in overalls and cap, standing at a machine"},{"id":"p2","name":null,"presence":["visible"],"appearance":"man in overalls and cap, welding or working near a large cylinder"},{"id":"p3","name":null,"presence":["visible"],"appearance":"man in dark clothing, standing near large machinery"}],"period":null,"quotes":[{"t":"12:48","text":"Edges of the dimension plates were shaped on a planing machine to assure precision and accuracy of later steps in their manufacture."},{"t":"12:57","text":"They were bent on a giant press"},{"t":"12:59","text":"and rolled into circular form."},{"t":"13:11","text":"formed a ring 30 feet in diameter"}],"objects":[{"name":"planing machine","evidence":"frame:1"},{"name":"large metal plates","evidence":"frame:1"},{"name":"giant press","evidence":"frame:2"},{"name":"cylindrical pipe sections","evidence":"frame:3, frame:4"},{"name":"welding equipment","evidence":"frame:2"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and methodical","themes":["industrial manufacturing","heavy engineering","scale of industrial production"],"style_notes":"static medium and wide shots, high-contrast black-and-white, functional lighting emphasizing machinery and scale"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:04:21.324102+00:00","id":"gov.archives.arc.37058:b36:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=768","transcript_segments":[186,187,188,189,190,191,192,193],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":37,"start_s":795.56226,"end_s":815.5155,"first_shot":145,"last_shot":147,"sequence":14,"keyframes":[{"t":797.2,"shot":145},{"t":804.2,"shot":146},{"t":812.6,"shot":147}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.9,"rhythm":0.28,"visual":0.14,"pause_s":0.9}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A large metal ring is shown being machined on a vertical lathe; the transcript describes joining sections to form penstocks weighing 150 to 184 tons. No people are visible or named, and the location is an industrial workshop.","observations":{"place":{"value":"factory","evidence":"frame:1","interior":true,"place_type":"factory"},"events":[{"t":797,"kind":"visible","text":"A large metal ring is positioned on a machine.","evidence":"frame:1"},{"t":804,"kind":"visible","text":"The ring remains on the machine, viewed from a different angle.","evidence":"frame:2"},{"t":813,"kind":"visible","text":"A close-up shows a cutting tool machining the edge of the ring.","evidence":"frame:3"},{"t":816,"kind":"spoken","text":"The transcript states that sections are machined to fit precisely when joined into penstocks.","evidence":"t:13:27"}],"people":[],"period":null,"quotes":[{"t":"13:16","text":"two of these rings joined"},{"t":"13:19","text":"weighing 150 to 184 tons."},{"t":"13:24","text":"A vertical lathe."},{"t":"13:27","text":"so the sections would fit precisely when joined into continuous penstocks inside the canyon walls."}],"objects":[{"name":"large metal ring","frame":1},{"name":"vertical lathe","frame":3},{"name":"cutting tool","frame":3}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and technical","themes":["industrial manufacturing","precision engineering","large-scale construction"],"style_notes":"static medium and close-up shots, high-contrast lighting emphasizing machinery, no human presence"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:04:21.328736+00:00","id":"gov.archives.arc.37058:b37:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=795","transcript_segments":[194,195,196,197,198,199],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":38,"start_s":815.5155,"end_s":849.2826,"first_shot":148,"last_shot":152,"sequence":14,"keyframes":[{"t":822.0,"shot":148},{"t":830.3,"shot":149},{"t":845.2,"shot":151},{"t":848.3,"shot":152}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.91,"rhythm":0.11,"visual":0.115,"pause_s":1.2}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A large pipe section is transported by a trailer and then moved by a cableway over a gorge. The transcript describes the logistics of moving these sections from a plant to a dam site.","observations":{"place":{"value":"canyon","reason":null,"evidence":"frame:3","interior":false,"place_type":"other"},"events":[{"t":830,"kind":"visible","text":"A train passes through a 30-foot section, revealing its comparative size.","evidence":"frame:2"},{"t":845,"kind":"visible","text":"A pipe section is suspended over a gorge by a cableway.","evidence":"frame:3"},{"t":848,"kind":"visible","text":"A cableway lowers a pipe section under absolute control.","evidence":"frame:4"},{"t":816,"kind":"spoken","text":"A train passing through one of the 30-foot sections reveals their comparative size.","evidence":"t:13:35"},{"t":842,"kind":"spoken","text":"A specially designed trailer carries sections down the highway from the plant to the dam site.","evidence":"t:13:47"},{"t":847,"kind":"spoken","text":"A 150-ton cableway relieves the trailer and swings the pipe sections out over the gorge.","evidence":"t:13:56"}],"people":[],"period":null,"quotes":[{"t":"13:35","text":"A train passing through one of the 30-foot sections"},{"t":"13:47","text":"a specially designed trailer, all the sections one at a time down the highway from the plant to the dam site."},{"t":"13:56","text":"A 150-ton cableway relieved the trailer of its tremendous burdens"},{"t":"14:02","text":"swung the pipe sections out over the gorge."}],"objects":[{"name":"pipe section","frame":1},{"name":"trailer","frame":2},{"name":"cableway","frame":4},{"name":"gorge","frame":3}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and documentary","themes":["engineering logistics","large-scale construction","transportation of heavy components"],"style_notes":"wide shots emphasize scale; high-angle shots show engineering; muted color palette suggests archival footage"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:04:55.083326+00:00","id":"gov.archives.arc.37058:b38:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=815","transcript_segments":[200,201,202,203,204,205,206,207,208],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":39,"start_s":849.2826,"end_s":851.5516,"first_shot":153,"last_shot":153,"sequence":15,"keyframes":[{"t":850.4,"shot":153}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.9,"rhythm":0.38,"visual":0.102,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A man in a white shirt and cap sits at a table, handling a mechanical device. The setting appears to be an indoor workspace with plain walls and a window.","observations":{"place":{"value":"other","evidence":"frame:1","interior":true,"place_type":"other"},"events":[{"t":850,"kind":"visible","text":"man sits at table and manipulates a mechanical device","evidence":"frame:1"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man, wearing white shirt, light-colored pants, and a white cap"}],"period":null,"quotes":[],"objects":[{"name":"mechanical device","evidence":"frame:1"},{"name":"table","evidence":"frame:1"},{"name":"white cap","evidence":"frame:1"},{"name":"white shirt","evidence":"frame:1"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"neutral, focused","themes":["work","mechanical operation"],"style_notes":"medium shot, static framing, flat lighting, documentary-style capture"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:04:55.086043+00:00","id":"gov.archives.arc.37058:b39:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=849","transcript_segments":[],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":40,"start_s":851.5516,"end_s":853.5535,"first_shot":154,"last_shot":154,"sequence":16,"keyframes":[{"t":852.6,"shot":154}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.89,"rhythm":0.16,"visual":0.112,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A close-up shot shows a large, dark, circular metal object mounted on a metallic structure. The surrounding surface is textured and appears industrial, with no people or text visible.","observations":{"place":{"value":"other","reason":"The setting is an industrial interior with metal surfaces and machinery; no specific named place type fits.","evidence":"frame:1","interior":true,"place_type":"other"},"events":[],"people":[],"period":null,"quotes":[],"objects":[{"name":"large circular metal object","evidence":"frame:1","description":"dark, ring-shaped, mounted on a metallic structure"},{"name":"metallic structure","evidence":"frame:1","description":"textured, industrial-looking surface with rivets or seams"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"mechanical, industrial","themes":["industrial machinery","mechanical design"],"style_notes":"close-up, static framing, high contrast between dark object and lighter background, grainy film texture"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:04:55.087812+00:00","id":"gov.archives.arc.37058:b40:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=851","transcript_segments":[],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":41,"start_s":853.5535,"end_s":854.85486,"first_shot":155,"last_shot":155,"sequence":17,"keyframes":[{"t":854.2,"shot":155}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.9,"rhythm":0.02,"visual":0.093,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A large industrial machine with exposed gears and wheels is shown in a warehouse-like space. No people or spoken dialogue are visible or audible in this beat.","observations":{"place":{"value":"warehouse","evidence":"frame:1","interior":true,"place_type":"warehouse"},"events":[],"people":[],"period":null,"quotes":[],"objects":[{"name":"industrial machine","evidence":"frame:1","description":"large, metallic, with exposed gears, wheels, and shafts"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"mechanical, utilitarian","themes":["industrial machinery","mechanical engineering"],"style_notes":"static medium shot, even studio lighting, no camera movement"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:05:04.069229+00:00","id":"gov.archives.arc.37058:b41:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=853","transcript_segments":[],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":42,"start_s":854.85486,"end_s":877.0771,"first_shot":156,"last_shot":160,"sequence":18,"keyframes":[{"t":857.6,"shot":156},{"t":862.6,"shot":157},{"t":871.1,"shot":159},{"t":875.6,"shot":160}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.91,"rhythm":0.31,"visual":0.093,"pause_s":6.0}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Workers are shown inside a large, circular tunnel structure during construction; the transcript describes trailers moving sections into place and joining them with pressure pins to form conduits. No named individuals or specific time of day are visible or mentioned.","observations":{"place":{"value":"tunnel interior","evidence":"frame:1","interior":true,"place_type":"other"},"events":[{"t":855,"kind":"spoken","text":"Trailers are waiting at portals of the access tunnels.","evidence":"t:14:15"},{"t":858,"kind":"visible","text":"Workers stand near large circular tunnel sections.","evidence":"frame:1"},{"t":863,"kind":"visible","text":"View inside a large circular tunnel section.","evidence":"frame:2"},{"t":871,"kind":"visible","text":"Workers are visible on ladders and platforms inside a curved tunnel section.","evidence":"frame:3"},{"t":876,"kind":"visible","text":"View down a tunnel section showing ladders and structural elements.","evidence":"frame:4"},{"t":877,"kind":"spoken","text":"Five sections were hoisted into location with cables and joined end-to-end with pressure pins.","evidence":"t:14:27"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"worker in light-colored shirt and dark pants, seen from back"},{"id":"p2","name":null,"presence":["visible"],"appearance":"worker in light shirt, visible on ladder inside tunnel"},{"id":"p3","name":null,"presence":["visible"],"appearance":"worker in light shirt, visible on platform inside tunnel"}],"period":null,"quotes":[{"t":"14:15","text":"Trailers waiting at portals of the access tunnels"},{"t":"14:18","text":"carried them to their permanent connections inside the main tunnels."},{"t":"14:23","text":"The five sections were hoisted into location with cables"},{"t":"14:27","text":"and joined end-to-end pressure pins to form continuous conduits between the intake towers, turbines and outlet valves."}],"objects":[{"name":"large circular tunnel section","evidence":"frame:1"},{"name":"ladder","evidence":"frame:3"},{"name":"cables","evidence":"t:14:23"},{"name":"pressure pins","evidence":"t:14:27"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and documentary","themes":["engineering","construction","industrial labor"],"style_notes":"static wide shots, high-contrast monochrome, emphasis on scale and structure"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:05:35.205382+00:00","id":"gov.archives.arc.37058:b42:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=854","transcript_segments":[209,210,211,212],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":43,"start_s":877.0771,"end_s":909.6096,"first_shot":161,"last_shot":165,"sequence":18,"keyframes":[{"t":881.2,"shot":161},{"t":887.3,"shot":162},{"t":903.5,"shot":164},{"t":907.5,"shot":165}],"boundary":{"reason":"topic shift in dialogue","scores":{"ocr":0.0,"topic":0.98,"rhythm":0.19,"visual":0.135,"pause_s":0.9}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows aerial views of a large dam under construction, with concrete being poured and structural elements visible. The transcript states that on May 29, 1935, the last concrete was placed in Hoover Dam, after two years of pouring, totaling over three million cubic yards.","observations":{"place":{"value":"Hoover Dam","reason":null,"evidence":"t:14:58","interior":false,"place_type":"other"},"events":[{"t":881,"kind":"visible","text":"Aerial view of dam construction site with buildings and scaffolding visible.","evidence":"frame:1"},{"t":887,"kind":"visible","text":"Aerial view of dam structure showing concrete sections and construction equipment.","evidence":"frame:2"},{"t":904,"kind":"visible","text":"Aerial view of dam crest and surrounding canyon walls.","evidence":"frame:3"},{"t":908,"kind":"visible","text":"Aerial view of concrete mixing or pouring equipment on dam structure.","evidence":"frame:4"},{"t":877,"kind":"spoken","text":"Continuous stream of concrete had been pouring into the dam.","evidence":"t:14:41"},{"t":877,"kind":"spoken","text":"The structure neared its full height of 726 feet, far above any other dam built by man.","evidence":"t:14:46"},{"t":877,"kind":"spoken","text":"On May 29th, 1935, Cruz placed the last concrete in Hoover Dam.","evidence":"t:14:58"},{"t":877,"kind":"spoken","text":"A total of three and one quarter million cubic yards of concrete was used.","evidence":"t:15:07"}],"people":[],"period":null,"quotes":[{"t":"14:41","text":"a continuous stream of concrete had been pouring into the dam for him."},{"t":"14:46","text":"The structure neared its full height of 726 feet."},{"t":"14:58","text":"On May 29th, 1935,"},{"t":"15:03","text":"Cruz placed the last concrete in Hoover Dam."}],"objects":[{"name":"concrete mixing equipment","frame":4},{"name":"scaffolding and construction structures","frame":1},{"name":"dam sections under construction","frame":2},{"name":"canyon walls","frame":3}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"documentary, factual","themes":["engineering achievement","construction scale","historical milestone"],"style_notes":"Aerial shots, wide framing, black-and-white film, industrial scale, no close-ups"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:05:43.903583+00:00","id":"gov.archives.arc.37058:b43:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=877","transcript_segments":[213,214,215,216,217,218,219,220],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":44,"start_s":909.6096,"end_s":930.5973,"first_shot":166,"last_shot":168,"sequence":18,"keyframes":[{"t":913.7,"shot":166},{"t":921.4,"shot":167},{"t":927.8,"shot":168}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.95,"rhythm":0.36,"visual":0.118,"pause_s":5.5},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The Hoover Dam is shown under construction, followed by a public dedication ceremony where President Franklin Delano Roosevelt speaks. The transcript states the dam was completed ahead of schedule and dedicated on September 30, 1935.","observations":{"place":{"value":"Hoover Dam construction site","evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":914,"kind":"visible","text":"The Hoover Dam is shown under construction with scaffolding and rock faces.","evidence":"frame:1"},{"t":921,"kind":"visible","text":"A crowd is seated on a decorated platform overlooking the dam site.","evidence":"frame:2"},{"t":928,"kind":"visible","text":"Franklin Delano Roosevelt stands at a podium speaking to the crowd.","evidence":"frame:3"},{"t":910,"kind":"spoken","text":"The dam is described as a modern civil engineering wonder completed two and a half years ahead of schedule.","evidence":"t:15:12"},{"t":910,"kind":"spoken","text":"The dedication of the Hoover Dam by President Franklin Delano Roosevelt on September 30, 1935, is mentioned.","evidence":"t:15:21"}],"people":[{"id":"p1","name":{"value":"Franklin Delano Roosevelt","evidence":"t:15:24"},"presence":["visible","audible"],"appearance":"man in dark suit, light shirt, glasses, medium build, middle-aged"},{"id":"p2","name":null,"presence":["visible"],"appearance":"crowd of men in suits and hats, some visible in bleachers"}],"period":null,"quotes":[{"t":"15:12","text":"this modern civil engineering wonder stood completed"},{"t":"15:16","text":"two and one half years"},{"t":"15:18","text":"ahead of schedule."},{"t":"15:24","text":"President Franklin Delano Roosevelt dedicated to Hoover Dam."}],"objects":[{"name":"Hoover Dam under construction","evidence":"frame:1"},{"name":"dedication platform with lights and flags","evidence":"frame:2"},{"name":"podium with microphones","evidence":"frame:3"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"solemn and ceremonial","themes":["national achievement","public ceremony","engineering progress"],"style_notes":"static medium shots, high-contrast black-and-white film, formal framing of the speaker and crowd"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:06:04.848268+00:00","id":"gov.archives.arc.37058:b44:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=909","transcript_segments":[221,222,223,224,225,226],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":45,"start_s":930.5973,"end_s":960.9276,"first_shot":169,"last_shot":169,"sequence":19,"keyframes":[{"t":945.8,"shot":169}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.96,"rhythm":0.69,"visual":0.158,"pause_s":1.2}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A single frame shows a large dam structure in a rocky canyon, with water flowing over its crest. The accompanying transcript praises the dam's design and describes it as conquering the Colorado River, with floodwaters lapping against it as the reservoir fills.","observations":{"place":{"value":"canyon","evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":946,"kind":"visible","text":"Water flows over the crest of a large dam in a rocky canyon.","evidence":"frame:1"},{"t":930,"kind":"spoken","text":"The narrator praises the dam's designers and builders.","evidence":"t:15:30"},{"t":933,"kind":"spoken","text":"The dam is described as standing like a sentinel in the desert sunlight.","evidence":"t:15:33"},{"t":942,"kind":"spoken","text":"Flood waters are described as lapping against the dam's arched back as the reservoir fills.","evidence":"t:15:42"},{"t":947,"kind":"spoken","text":"The reservoir is described as spreading into valleys and canyons among colorful hills and mountains.","evidence":"t:15:47"},{"t":955,"kind":"spoken","text":"The dam is identified as Hoover Dam.","evidence":"t:15:55"},{"t":956,"kind":"spoken","text":"Hoover Dam is said to have conquered the Colorado River.","evidence":"t:15:56"}],"people":[],"period":null,"quotes":[{"t":"15:30","text":"He praised its designers and builders."},{"t":"15:33","text":"The dam stood like a sentinel"},{"t":"15:42","text":"Flood waters lapped helplessly against its arched back"},{"t":"15:55","text":"Hoover Dam"}],"objects":[{"name":"dam","evidence":"frame:1","description":"large, arched concrete structure spanning a canyon, with water flowing over its crest"},{"name":"canyon","evidence":"frame:1","description":"rocky, steep-walled gorge surrounding the dam"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"reverent and awe-struck","themes":["human engineering triumph over nature","monumental infrastructure","taming of a wild river"],"style_notes":"wide-angle shot emphasizing scale of dam against natural canyon; high-contrast lighting highlights water and rock textures"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:06:15.344378+00:00","id":"gov.archives.arc.37058:b45:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=930","transcript_segments":[227,228,229,230,231,232,233,234,235],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":46,"start_s":960.9276,"end_s":1026.4932,"first_shot":170,"last_shot":171,"sequence":20,"keyframes":[{"t":968.7,"shot":170},{"t":1001.5,"shot":171}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.97,"rhythm":0.28,"visual":0.182,"pause_s":5.9},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows interior shots of a large, unfinished turbine pit at Hoover Dam, with a worker standing near its edge. The transcript describes the installation timeline of generators, including the final unit N8, which was installed after a 25-year gap.","observations":{"place":{"value":"powerhouse interior","evidence":"frame:1","interior":true,"place_type":"other"},"events":[{"t":969,"kind":"visible","text":"A worker stands on the edge of a large circular turbine pit.","evidence":"frame:1"},{"t":1002,"kind":"visible","text":"A dark, narrow opening is visible in a concrete wall.","evidence":"frame:2"},{"t":962,"kind":"spoken","text":"Turbine pits for Hoover Dam's hydroelectric units were built into the powerhouse.","evidence":"t:16:02"},{"t":969,"kind":"spoken","text":"Generator installations began in 1935.","evidence":"t:16:09"},{"t":972,"kind":"spoken","text":"The first generator, Unit M2, began commercial operation October 26th to serve Los Angeles.","evidence":"t:16:12"},{"t":980,"kind":"spoken","text":"The generators filled the pits as demand for electrical energy in California, Nevada and Arizona called them into service.","evidence":"t:16:25"},{"t":993,"kind":"spoken","text":"The last generator, N8, was manufactured and installed in 1959 after lying dormant for 25 years.","evidence":"t:16:33"},{"t":1010,"kind":"spoken","text":"Plants throughout the nation fabricated N8's many parts.","evidence":"t:17:01"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man wearing light-colored work clothes and helmet, standing on concrete edge"}],"period":null,"quotes":[{"t":"16:02","text":"Turbine pits to hold Hoover Dam's 17 big hydroelectric units were built into the powerhouse."},{"t":"16:12","text":"The first generator, Unit M2, began commercial operation October 26th"},{"t":"16:33","text":"Finally in 1959"},{"t":"16:42","text":"For 25 years, the N8 pit had lain dormant in silence."}],"objects":[{"name":"turbine pit","evidence":"frame:1","description":"large circular concrete structure with vertical walls"},{"name":"worker","evidence":"frame:1","description":"man in light-colored work clothes and helmet"},{"name":"concrete wall","evidence":"frame:2","description":"rough-textured wall with embedded rebar and a narrow vertical opening"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and documentary","themes":["industrial construction","hydroelectric power","historical engineering"],"style_notes":"static wide shots, high-contrast lighting emphasizing scale and texture of concrete structures"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:06:46.687613+00:00","id":"gov.archives.arc.37058:b46:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=960","transcript_segments":[236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":47,"start_s":1026.4932,"end_s":1057.6577,"first_shot":172,"last_shot":174,"sequence":21,"keyframes":[{"t":1031.5,"shot":172},{"t":1041.9,"shot":173},{"t":1052.4,"shot":174}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.94,"rhythm":0.37,"visual":0.22,"pause_s":5.8},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"The beat shows workers assembling a massive turbine and butterfly valve inside a power plant, with narration describing the generator's specifications and water control mechanism. No names are spoken, and the setting is industrial machinery within a large hall.","observations":{"place":{"value":"power plant interior","evidence":"frame:1","interior":true,"place_type":"factory"},"events":[{"t":1032,"kind":"visible","text":"Workers stand near a large turbine assembly in a factory hall.","evidence":"frame:1"},{"t":1042,"kind":"visible","text":"Men on scaffolding inspect or work on the upper section of the turbine.","evidence":"frame:2"},{"t":1052,"kind":"visible","text":"Workers gather around a massive butterfly valve being installed.","evidence":"frame:3"},{"t":1026,"kind":"spoken","text":"Narration describes a 95,000 kilowatt, 60 cycle, 16,500 volt generator driven by a 115,000 horsepower turbine.","evidence":"t:17:09"},{"t":1041,"kind":"spoken","text":"Narration explains that falling water from the reservoir spins the turbine wheel and is controlled by a huge butterfly valve.","evidence":"t:17:21"},{"t":1058,"kind":"spoken","text":"Narration states the butterfly valve weighs 2,000 tons and its parts were shipped to Hoover Dam.","evidence":"t:17:33"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man in work clothes, medium build, visible on scaffolding"},{"id":"p2","name":null,"presence":["visible"],"appearance":"man in work clothes, wearing white hard hat, standing near large valve"},{"id":"p3","name":null,"presence":["visible"],"appearance":"man in work clothes, standing near turbine base"}],"period":null,"quotes":[{"t":"17:09","text":"It is a 95,000 kilowatt"},{"t":"17:12","text":"60 cycle"},{"t":"17:13","text":"16,500 volt generator driven by a 115,000 horsepower turbine."},{"t":"17:33","text":"Weighing 2,000 tons, N8 parts were shipped to Hoover Dam"}],"objects":[{"name":"turbine assembly","frame":1},{"name":"butterfly valve","frame":3},{"name":"scaffolding","frame":2},{"name":"hard hats","frame":3}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"technical and documentary","themes":["industrial engineering","hydroelectric power","construction"],"style_notes":"static wide shots, industrial lighting, emphasis on scale and machinery"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:06:57.502530+00:00","id":"gov.archives.arc.37058:b47:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=1026","transcript_segments":[255,256,257,258,259,260,261],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":48,"start_s":1057.6577,"end_s":1078.345,"first_shot":175,"last_shot":176,"sequence":22,"keyframes":[{"t":1059.6,"shot":175},{"t":1070.0,"shot":176}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.97,"rhythm":0.63,"visual":0.152,"pause_s":5.7},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A train carrying large industrial parts moves along a curved track near a canyon, and a massive component is suspended by a cableway over the gorge. The transcript describes the delivery of parts to a dam site, noting that such lifts were routine.","observations":{"place":{"value":"canyon","evidence":"frame:1, t:17:41","interior":false,"place_type":"other"},"events":[{"t":1060,"kind":"visible","text":"A train carrying large industrial parts moves along a curved road near a canyon.","evidence":"frame:1"},{"t":1070,"kind":"visible","text":"A large industrial component is suspended mid-air by a cableway over a gorge.","evidence":"frame:2"},{"t":1058,"kind":"spoken","text":"Parts were delivered via 60 rail cars to the canyon rim.","evidence":"t:17:38"},{"t":1060,"kind":"spoken","text":"Parts were lifted by cableway over the canyon and lowered to the powerhouse.","evidence":"t:17:41"},{"t":1070,"kind":"spoken","text":"Descending parts on cable strands were a familiar, almost daily sight.","evidence":"t:17:55"}],"people":[],"period":null,"quotes":[{"t":"17:38","text":"on 60 rail cars."},{"t":"17:41","text":"Arriving at the canyon rim overlooking the dam, the parts were lifted by cableway and"},{"t":"17:50","text":"out over the canyon,"},{"t":"17:55","text":"Parts descending into the gorge on strands of cable were familiar and almost daily sights, reminiscent of previous installations."}],"objects":[{"name":"train","frame":1,"description":"large freight train carrying industrial equipment"},{"name":"cableway","frame":2,"description":"steel tower structure with cables suspending a large component"},{"name":"industrial component","frame":2,"description":"massive, boxy metal part being lowered by cable"},{"name":"road","frame":1,"description":"curved asphalt road with yellow dividing line"},{"name":"power lines","frame":1,"description":"large transmission towers visible in background"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and documentary","themes":["engineering logistics","industrial construction","routine of large-scale operations"],"style_notes":"wide shots, static framing, natural daylight, emphasis on scale of machinery and landscape"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:07:19.068103+00:00","id":"gov.archives.arc.37058:b48:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=1057","transcript_segments":[262,263,264,265,266],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":49,"start_s":1078.345,"end_s":1099.266,"first_shot":177,"last_shot":184,"sequence":23,"keyframes":[{"t":1079.3,"shot":177},{"t":1083.8,"shot":179},{"t":1091.8,"shot":182},{"t":1097.1,"shot":184}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.92,"rhythm":0.69,"visual":0.175,"pause_s":6.0},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Two men in hard hats are seen near a large dam structure; one holds a yellow signaling device. A heavy vehicle transports a large component across a bridge in front of the dam. The transcript mentions workers who helped install and operate the cableway during the dam's construction in the early 1930s.","observations":{"place":{"value":"dam","reason":null,"evidence":"frame:1","interior":false,"place_type":"other"},"events":[{"t":1079,"kind":"visible","text":"A man in a hard hat looks up at a dam structure.","evidence":"frame:1"},{"t":1084,"kind":"visible","text":"A man holds up a yellow signaling device near water and dam machinery.","evidence":"frame:2"},{"t":1092,"kind":"visible","text":"A close-up of a yellow signaling device held in front of dam turbines.","evidence":"frame:3"},{"t":1097,"kind":"visible","text":"A heavy vehicle carries a large component across a bridge in front of the dam.","evidence":"frame:4"},{"t":1084,"kind":"spoken","text":"The main cableway operator was the same one who had helped install and operate the cableway during the dam's construction in the early 1930s.","evidence":"t:18:04"},{"t":1087,"kind":"spoken","text":"Others likewise had worked on the project throughout its construction.","evidence":"t:18:14"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man wearing light blue shirt, dark overalls, white hard hat, seen from behind"},{"id":"p2","name":null,"presence":["visible"],"appearance":"man wearing light short-sleeved shirt, light pants, watch, holding yellow signaling device"},{"id":"p3","name":null,"presence":["visible"],"appearance":"man in white hard hat, seen from back, walking near vehicle"},{"id":"p4","name":null,"presence":["visible"],"appearance":"man in white hard hat, seen from side, walking near vehicle"}],"period":null,"quotes":[{"t":"18:04","text":"and the main cableway operator was the same one who had helped install and operate the cableway"},{"t":"18:10","text":"during the dam's construction in the early 1930s."},{"t":"18:14","text":"Others likewise had worked on the project"},{"t":"18:17","text":"throughout its construction."}],"objects":[{"name":"yellow signaling device","evidence":"frame:2"},{"name":"dam structure with turbines","evidence":"frame:1"},{"name":"heavy vehicle transporting large component","evidence":"frame:4"},{"name":"hard hats","evidence":"frame:1"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"documentary, observational","themes":["industrial labor","engineering","historical construction"],"style_notes":"static medium shots, bright daylight, industrial framing, focus on machinery and workers"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:07:36.864158+00:00","id":"gov.archives.arc.37058:b49:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=1078","transcript_segments":[267,268,269,270],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":50,"start_s":1099.266,"end_s":1116.3163,"first_shot":185,"last_shot":187,"sequence":23,"keyframes":[{"t":1101.6,"shot":185},{"t":1104.7,"shot":186},{"t":1110.9,"shot":187}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.91,"rhythm":0.54,"visual":0.122,"pause_s":6.0},"during_speech":"cut falls inside a spoken line: no pause was available without exceeding the length cap"},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"A man in light-colored work clothes gestures toward large electrical equipment in a powerhouse. Inside, technicians are shown working with machinery and telephones, and a wide shot reveals massive generators in a long hall.","observations":{"place":{"value":"powerhouse","evidence":"t:18:28","interior":true,"place_type":"factory"},"events":[{"t":1102,"kind":"visible","text":"A man gestures toward large electrical equipment outside.","evidence":"frame:1"},{"t":1105,"kind":"visible","text":"A person's hand operates a switch or lever at a control panel.","evidence":"frame:2"},{"t":1111,"kind":"mentioned","text":"Technicians are assembling and installing electrical cargo inside the powerhouse.","evidence":"t:18:31"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"man, middle-aged, wearing light-colored short-sleeved shirt and trousers, watch on left wrist"},{"id":"p2","name":null,"presence":["visible"],"appearance":"person, visible only by arm and hand, wearing light-colored long-sleeved shirt"}],"period":null,"quotes":[{"t":"18:28","text":"Inside the Nevada wing of the powerhouse,"},{"t":"18:31","text":"technicians assembled and installed the mass of electrical cargo."}],"objects":[{"name":"large electrical generators","frame":1},{"name":"telephone","frame":2},{"name":"control panel with levers","frame":2},{"name":"massive turbine generators","frame":3},{"name":"metal railing","frame":1}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial, documentary","themes":["industrial infrastructure","technical labor","power generation"],"style_notes":"static wide and medium shots, functional lighting, no dramatic framing"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:07:44.198306+00:00","id":"gov.archives.arc.37058:b50:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=1099","transcript_segments":[271,272],"status_note":"machine annotation; observations carry evidence references (frame:n, t:m:ss); interpretations are model opinion"},{"idx":51,"start_s":1116.3163,"end_s":1145.5789,"first_shot":188,"last_shot":190,"sequence":24,"keyframes":[{"t":1119.3,"shot":188},{"t":1132.9,"shot":189},{"t":1144.5,"shot":190}],"boundary":{"reason":"pause in speech","scores":{"ocr":0.0,"topic":0.92,"rhythm":0.39,"visual":0.211,"pause_s":1.2}},"cutter_version":"beats-0.2","annotation_version":1,"model":"Qwen/Qwen3-VL-235B-A22B-Instruct","prompt_version":"beats-0.2","summary":"Crews prepare a pit for a generating unit by removing slabs and lowering turbine sections into place, which are then bolted and anchored in concrete. Workers are visible in hard hats around heavy machinery and large metal components inside an industrial structure.","observations":{"place":{"value":"factory","evidence":"frame:1","interior":true,"place_type":"factory"},"events":[{"t":1116,"kind":"spoken","text":"Crews prepared the N8 pit to receive the new generating unit.","evidence":"t:18:36"},{"t":1133,"kind":"spoken","text":"They removed temporary slabs over the turbine and relief valve outlets to the tailrace river.","evidence":"t:18:41"},{"t":1144,"kind":"spoken","text":"Liners assembled in these openings were set in concrete.","evidence":"t:18:48"},{"t":1144,"kind":"spoken","text":"The turbine's scroll case sections were lowered into the pit.","evidence":"t:18:52"},{"t":1144,"kind":"spoken","text":"Sections were leveled, bolted together, and a lie.","evidence":"t:18:56"},{"t":1144,"kind":"spoken","text":"The completed scroll case was then anchored in concrete.","evidence":"t:19:01"},{"t":1119,"kind":"visible","text":"Workers stand near a large circular pit with machinery.","evidence":"frame:1"},{"t":1133,"kind":"visible","text":"A worker stands on a large curved metal section inside a structure.","evidence":"frame:2"},{"t":1144,"kind":"visible","text":"Workers in hard hats work around metal scaffolding and large components.","evidence":"frame:3"}],"people":[{"id":"p1","name":null,"presence":["visible"],"appearance":"worker in hard hat and light-colored uniform, visible in frame:1 and frame:3"},{"id":"p2","name":null,"presence":["visible"],"appearance":"worker in hard hat, visible in frame:2"}],"period":null,"quotes":[{"t":"18:36","text":"crews prepared the N8 pit"},{"t":"18:41","text":"They removed temporary slabs over the turbine and relief valve outlets to the tailrace river."},{"t":"18:52","text":"The turbine's scroll case sections were lowered into the pit."},{"t":"19:01","text":"The completed scroll case was then anchored in concrete."}],"objects":[{"name":"circular pit","evidence":"frame:1"},{"name":"crane or lifting machinery","evidence":"frame:1"},{"name":"turbine scroll case sections","evidence":"frame:2"},{"name":"concrete liners","evidence":"frame:2"},{"name":"scaffolding and rebar","evidence":"frame:3"},{"name":"hard hats","evidence":"frame:1, frame:3"}],"time_of_day":null,"on_screen_text":null},"interpretations":{"mood":"industrial and procedural","themes":["industrial construction","engineering labor","mechanical assembly"],"style_notes":"high-angle shots, static framing, black-and-white, utilitarian lighting focused on machinery and workers"},"review_status":"unreviewed","qa":null,"created_at":"2026-09-06 03:08:24.097744+00:00","id":"gov.archives.arc.37058:b51:beats-0.2","archive_url":"https://archive.org/details/gov.archives.arc.37058?start=1116","transcript_segments":[273,274,275,276,277,278,279,280,281],"status_note":"machine annotation; 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