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324 McCoy AND WARNER October
was demonstrated at the Convention of the Society of Motion Picture Engineers at the Statler Hotel, New York, the programs being relayed in part via balanced telephone wires, furnished by the telephone company, from the Empire State Building to the hotel. The RCA-FoxWarner group has also developed intermediate-film equipment.
III. THEATER EQUIPMENT REQUIRED
The equipment required for theater television falls into two general! categories, the equipment installed in the theater for receiving the pro^ gram and projecting it to the screen, and the equipment used outA side the theater for pickup of programs and relay to the theater.
The first problem undertaken by the engineers in developing theatei television was the development of equipment for installation in the theater. This equipment has now reached the point where two systems of equipment are reported to be substantially ready for commercial use: the direct (or instantaneous-projection} system, anc the intermediate-film (or film-storage) system."2
The direct-projection system, developed in the United States by the RCA-FoxWarner group, consists of (1) the receiver-projector, which includes a projection cathode-ray tube as the source of the light image, and the optical system which projects the image to the screer by a reflective process ; (2) a viewing screen ; (3) a television contro console; and (4) a power-supply rack and high-voltage power unit.3 I] the television program is brought to the theater by a microwave relaj; system, the theater installation will also include a receiving antenna receiver, and a transmission line to carry the program from the antenna to the receiver.
RCA's new projector, demonstrated to the SMPE Convention on April 4, 1949, utilizes a 12-inch cathode-ray picture tube inclosed in a barrel about the size and appearance of a Bendix home washind machine. The optical system enclosed in the same barrel employs a 21-inch spherical mirror and a correcting lens, employing the Schmidtj| type optical system. As installed, the picture tube faces the rear oi the theater and projects the picture on the spherical mirror which reli fleets it toward the screen. The picture passes through the correcting lens on its way to the screen. The picture tube operates with 80,00(( volts as compared to the 9000 volts used in most home television rd ceivers. The optical system is capable of projecting a screen image IS by 24 feet, which is larger than the average motion picture screen! The entire projector unit weighs about 180 pounds and is designed foij