Problem in making sound films:-
1. Synchronization of two machines
-projector and sound playback.
2. Intermittent motion (stop and start) of projector continuous even - rolling motion required for sound playback.
Sound amplification
-there was no way to fill up a theater with acoustic sound.
Thomas Alva Edison
-First thought of the kinetoscope as a companion invention to his very popular phonograph and field a patent for " Motion Pictures With Sound " after fadweard maybridge visited him in Menlo Park, NJ and showed him his series of motion photographs in 1887.
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