How to add sound to amateur films (1954)

Page scan 00048 from How to add sound to amateur films

Record Details:

Title:
How to add sound to amateur films
Date:
1954
Publisher:
London : Focal Press
Volume:
How to add sound to amateur films
Leaf #:
00048
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 05, 2024
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the light on the photo-cell fluctuates rapidly. The current delivered by the photo-cell therefore fluctuates to provide electrical impulses which are a replica of those originally applied to the light valve. The equipment required for reproducing sound from an optical sound track is not very complex. A lamp, lens system, photo-cell, amplifier and loudspeaker are the principal components. Consequently optical sound film In the optical reproduction of sound, the sound track along the edge of the film (here 9-5-mm.) passes round the scanning drum, and obstructs a light beam to a greater or lesser extent. This varies the intensity of the light beam which falls on the photo-cell. 44