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TALK1 N G MOVIES
The camera is driven by a syncrhonous motor and in this way it is possible to use as many cameras as necessary on a shot, without having trouble with the synchronism. In designing the camera we have been very careful to keep the thing entirely practical and noiseless. In the camera the distance from the centre of the picture to the corresponding sound below the picture is 7%". The film is developed in the usual manner, preferably in a slow working developer. At present printing is done in a continuous printer, running through once for the sound and once for the picture exposure. The printer prints the picture with reference to the sound so that on the positive the difference between the picture and corresponding sound is 14*£".
The attachment for the projector for reproducing the sound film was designed to apply to the standard machines. It is applied below the head by fastening to the main casting and dropping down the take-up magazine. This attachment consists essentially of an accurate sprocket in a shaft with a large flywheel to give uniform velocity to the film. A 25 Watt straight coil filament lamp, fed by means of a high quality lens system upon one of the special slits, similar to the one described above and used in the camera. As the sound waves pass the slit they cause variations in the light. These variations fall upon a barium photo-electric cell which change the light variations into electrical variations. These electrical variations are amplified and come out as sound through the loud speakers placed at the screen.
This barium photo-electric cell is the only one that we have found which is sufficiently