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lens structure may be mounted to cover either a 5-in or 10-in. kinescope. A rigid supporting bracket holds the lens in place and aids in minimizing the effect of vibration.
The sound drive mechanism is driven through a separate electric motor which, as mentioned previously, is interlocked to the intermittent drive during starting and stopping periods. At synchronous running speed the interlocking mechanism disengages and the entire sound mechanism is independent of the varying loads of the intermittent drive. This motor provides a direct drive to a vertically mounted drive shaft having two worm gears which engage worms for the two sprockets of the tight-loop film system. Tension rollers are connected through a common coil spring, with damping provided by a dashpot filled with a viscous liquid. A heavy flywheeland-drum assembly is mounted with precision bearings. Under normal operating conditions the wow content measured between 2 and 20 cycles is 0.04%, while the flutter measured between 20 and 300 cycles is 0.25%. It is believed that this can be improved by the use of closer tolerances in the gear drive.
The camera is designed specifically to accommodate an RCA MI-10387-A optical system (Fig. 6) which is capable of making either a negative or a direct positive track by a change in the position of the galvanometer. The only structural change from the standard studio optical system is in the position of the monitor screen which has been reversed to permit observation from the left side.
The optical-system base contains the necessary Cannon connectors, the lamp current rheostat, meter and switch; galvanometer on-off-bias switch and the galvanometer-to-line matching transformer.
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The 35mm single-system cameras used at the NBC Kinescope Recording plants in Hollywood and New York are
Fig. 6. The RCA MI-10387-A optical system.
the result of joint design between the Producers Service Co., NBC, and RCA Film Recording. Specifications set by NBC for the camera included the soundrecording features.
The knowledge and experience of the RCA Film Recording engineers were utilized in arriving at the design of the sound mechanism of the camera. The integration of design information w< made by the Producers Service Co. Burbank, Calif., who designed and manufactured the entire camera, except for the optical system used for sound recording. This unit is a standard RCA item. The camera, while built primarily for NBC, is available to anyone from the Producers Service Co., except for the RCA optical system which is supplied by the RCA Film Recording Division.
The writer would like to express his appreciation to John P. Kiel of the Producers Service Co. for his aid in the preparation of this paper.
References
1. Ralph E. Lovell, "Time-zone delay of television programs by kinescope recording," Jour. SMPTE, 60: 235-239, Mar. 1953.
2. T. H. James and G. C. Higgins, Fundamentals of Photographic Theory, John Wiley and Sons, New York, 1948, p. 58.
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June 1954 Journal of the SMPTE Vol. 62