Synchronization and Speed Control of Synchronized Sound Pictures
H. M. Stoller · Transactions of the Society of Motion Picture Engineers · 1928
WHEN Thomas A. Edison gave a demonstration of his talking motion pictures nearly 16 years ago one of his chief problems was proper synchronization between his acoustic phonograph and the motion picture projector. It was then necessary to locate the phonograph behind the screen in order to make the sound appear to come from the picture. A system of belts and pulleys running from one end of the theatre to the other was used to secure synchronization with the projector in the booth.