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724 T. D. CUNNINGHAM [J. S. M. P. E.
The curved surface of the sound film gate is hardened and polished to facilitate the smooth passage of film. The shoe-holder provides two spring-steel shoes which are adjusted by means of two tension springs. This design assures a constant normal pressure over the surface of contact and reduces wear. Adjustable guide rollers located at the top of the sound film gate maintain the sound track in its proper relation to the light beam. At the bottom of the sound film gate, an idler roller passes the film on to the impedance roller around which the film is wrapped. Below the guide roller is the constantspeed precision sprocket which pulls the film through the sound film gate over the idler and impedance rollers. The function of the im
Impedance Roller
ConaW Speed Spock
TaAe " Up <3 prockc
FIG. 4. View of type PS-16 sound attachment.
pedance roller is to impart mass to the film and thereby steady its motion. The take-up sprocket is located beneath the constantspeed sprocket, to prevent lower magazine reaction from affecting the constant-speed sprocket.
The path of the film through the film compartment of the sound attachment is shown by Fig. 5.
The photo-cell compartment houses a UX-868 Radiotron with its socket, a photo-cell coupling transformer, and an exciter lamp rheostat, and ammeter. The photo-cell coupling transformer is mounted upon sponge rubber inside a shielded case. The photo-cell socket is mounted directly on top of this case, thus keeping the connecting leads as short as possible and permitting them to be com