Cinematographic annual : 1930 (1930)

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RCA PHOTOPHONE SYSTEM H53 jective focuses the image of the slit on the film, reducing it at the same time by a 4 to 1 ratio. This results in a light image on the film .00075" wide and .070" long. Under normal operating conditions, only one-half the sound track is exposed. The light which normally would expose the Bicycle Bell Orchestra Woman's Voice FIGURE 4 Examples of PJwtopJione variable area sound track showing different complex wave forms. other half of the track is intercepted by this white celluloid screen. This has graduations marked on it denoting the limits thru which the light beam may move without over-modulating the film or, in other words, without overshooting the sound track. As alternating current is fed from the amplifier to the vibrator, it causes the loop to twist back and forth. This rocks the mirror and increases or decreases the length of the slit image on the film. The width of the slit image being at all times constant, the result is a sound track of varying width which has the appearance of a serrated edged exposure. The shape of these