Journal of the Society of Motion Picture Engineers (1930-1949)

Fig. 1. A theater installation, showing the dual unit mounting terns nor protective devices with the Trad theater television unit. The remote-control unit (Fig. 3) is mounted in the motion picture projection booth near one of the port holes. This remote-control unit provides for the adjustment of contrast, vertical and horizontal hold, and also for the switching from one of the dual units to the other, in the event that any trouble develops in the one in operation. It is here that the operator stations himself and it is these^ controls alone which he will find it necessary to manipulate during the normal operation of the equipment. Signals are provided by a monitor, Fig. 4, containing a television receiver and providing video amplification for any remote programs from either microwave link or the coaxial cable. It also provides a third service in that the television receiver which it contains, when connected to a suitable antenna, can provide off-the-air signals from local television broadcasters, should these be required. Getting back to the main unit. Figs. 5A and 5B show some of the unique features which have resulted from the long practical experience with this type of device. The patented Trad theater projection television unit was designed not only from the standpoint of operational simplicity but also to project the greatest possible amount of light from the projection tube to the screen. As can be seen, the obstacles to the reflected rays of light have been minimized. It is interesting to note that, with a mirror diameter of 14 in. and a focal length of 6.6 in., the effective 126 August 1952 Journal of the SMPTE Vol.59