Sound of a Stone

We digitized and uploaded this film from the Prelinger Archive. Email us at footage@avgeeks.com if you have questions about the footage and are interested in using it in your project. sound-of-a-stone

Sound Recording And Reproduction (1941)

Describes how sound is converted into light rays to produce sound motion pictures and how the light rays are converted back into sound waves. Shows sound recording by both variable area and variable density. Features footage of James A. Brill, the narrator of many ERPI and early Encyclopedia Britannica films. Contact footage@avgeeks.com for more information. […]