WHAT IS SOUND?
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
Registration MP5043 No renewal found
- Term began
- 1949-06-15
- Claimant
- Leonard Peck Productions
- Class
- MP — published motion picture other than a photoplay (numbering series begun 1946)
- Finding
- no renewal entry found for 1976-1978 in the CCE motion-picture renewal sections or in the Copyright Office renewal records 1978-2025
- In the public domain since
- 1 January 1978 (end of the 28th year, no renewal)
An automated finding, not a verdict. A renewal would have appeared in the Copyright Office's renewal registrations 27 to 29 years after the term began. Those volumes are loaded and our parse of them found no matching renewal. If that is right, a work published 1931–1963 that was not renewed entered the public domain at the end of its 28th year; the volumes are OCR of old print, and the method page reports how often the parse has been found to miss one.
A renewal had to be filed in the 28th year and would be listed in the 1976 or 1977 volume; volumes searched: 1976, 1977, 1978.
Catalog entry
Catalog of Copyright Entries, Third Series, Parts 12–13: Motion Pictures, 1950, Internet Archive catalogofcopyri341213libr (OCR text), lines 21168–21180.
Summary: 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 elemen- tary school science classes. Credits: Advisers, Gerald S. Craig, Helen Warrin. © Leonard Peck Productions; 15Jun49; MP5043.
Copies on the Internet Archive
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