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Talking Pictures
the picture is edited. A variation of it, however, is used extensively as a supplementary process in the making of musical films.
In the wax process, the sound record is engraved with a jeweled stylus into a flat round cake of chemical soap about two inches thick. This stylus either vibrates up and down, cutting a so-called "hill and dale" type record, or sideways, cutting the wiggly trough seen in ordinary phonograph records. This movement is in accord with the varying electrical current set up by the voices impinging on the stage microphone. The one disadvantage of the light ray recording is that we cannot hear what has been said for several hours after the film has been developed.
It is possible to "play back" the record on the chemical soap, usually but incorrectly called "wax," but one such play back might ruin the record. Normally the record is merely the original mold for a later one made of hard vulcanized rubber, like that of a phonograph.
Although this is not necessary for speaking scenes, for musical pictures it is important that the artists hear immediately the number they have just sung or played. To take care of this need, a record was developed with a metal base on which a compound similar to celluloid had been placed in a thin layer. This layer is stout enough, having been cut by the stylus, to reproduce the sounds several times, enabling the artists to check the quality of their musical productions.
Sound recording on location proved an early problem of the talking picture. In the studio, sound recording
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