How to add sound to amateur films (1954)

Page scan 00025 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 #:
00025
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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If they do not, there will be an unpleasant change in pitch of the music at the change-over. Fortunately it is easy to check your turntable speeds if you have alternating current (A.C.) mains supply. Stroboscopes The electric current flowing through a lamp operating from A.C. mains constantly reverses its direction. It does A typical stroboscopic disc for use on a gramophone turntable. When illuminated by a lamp running on an A.C. supply, each set of bars appears stationary at a particular speed of rotation. Reading from outside to centre, the rings contain 180, 78, 77 and 76 bars respectively. With a 50-cycle A.C. supply, these correspond to speeds of 33£, 76-9, 77-9 and 78-9 r.p.m. 21