{"e":{"id":287710,"source":"ia_catalogofcopyri341213libr","title":"WHAT IS SOUND?","header":"Explores the nature, source, and transmission of sound waves. Shows that all sound is caused by vibration, demonstrates how sound travels through solids, liquids, and gases, and explains why sounds vary in pitch. For elementary school science classes. Credits: Advisers, Gerald S. Craig, Helen Warrin","year":1949,"reels":null,"feet":null,"sound":false,"credits":null,"notes":[],"line_start":21168,"line_end":21180,"source_text":"Summary: Explores the nature, source, \nand transmission of sound waves. Shows \nthat all sound is caused by vibration, \ndemonstrates how sound travels through \nsolids, liquids, and gases, and explains \nwhy sounds vary in pitch. For elemen- \ntary school science classes. \n\nCredits: Advisers, Gerald S. Craig, \nHelen Warrin. \n\n© Leonard Peck Productions; 15Jun49; \nMP5043. ","source_meta":{"name":"Catalog of Copyright Entries, Third Series, Parts 12–13: Motion Pictures, 1950","url":"https://archive.org/details/catalogofcopyri341213libr","cite":"Internet Archive catalogofcopyri341213libr (OCR text)","file":"/root/projects/publicreel/data/raw/cce_third_series/1950_catalogofcopyri341213libr_djvu.txt"},"ia_items":[],"ia_lookup":[],"atlas":[]},"regs":[{"id":306617,"entry_id":287710,"reg_number":"MP5043","series":3,"see_also":[],"reg_class":"MP","published":true,"claimant":"Leonard Peck Productions","author":null,"deposit":null,"reg_date":"1949-06-15","part":null,"part_title":null,"source_line":21179,"raw":"ation, demonstrates how sound travels through solids, liquids, and gases, and explains why sounds vary in pitch. For elementary school science classes. Credits: Advisers, Gerald S. Craig, Helen Warrin © Leonard Peck Productions; 15Jun49; MP5043","flags":[],"status":"no-renewal-found","pd_date":"1978-01-01","reason":"no renewal entry found for 1976-1978 in the CCE motion-picture renewal sections or in the Copyright Office renewal records 1978-2025","match_kind":null,"match_confidence":null,"title_similarity":null,"renewals":[],"window":[1976,1977],"window_volumes":[{"year":1976,"ia_identifier":"1976motionpictur3301213libr"},{"year":1977,"ia_identifier":"1977motionpictur3311213libr"},{"year":1978,"ia_identifier":""}]}]}