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Sound Recording
duces a constant exposure, but the moving mirror gives an image of a wavy line of light varying in width.
We are speaking here of a separate camera and a separate recording machine. There is a camera used by newsreel operators which has both photographic equipment and sound recording device in the same box, doing both jobs at one time and on the same film. But in studio practice it is more convenient to keep the processes separate.
We now have a "sound track" which has photographically recorded voice values delivered to a microphone. How is that "sound track," in a theatre, transformed back again to sound?
In the release prints used in the theatre, sound and sight are on the same piece of film. In the projection machine one light shines through the picture, carrying its image to the screen. iVnother light shines through the sound track onto a photoelectric cell. This cell sets up electrical current changes, duplicating those which were caused originally within the microphone on the studio sta^e. In turn these current variations are amplified and activate the diaphragm in the reproducing horns. The horns are giant variations of those used in radio receivers. Because of this, one hears in the theatre, properlv amplified to meet the needs of its size, exactly the same "words and music" which were spoken to the original microphone months before.
As we have seen there is also a process for making wax records similar to those used for a phonograph and synchronizing them to the speed of the camera. It has been said that the process presents some problems when
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