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PRINCIPAL ELEMENTS OF THE SENDING TERMINAL OF RCA ULTRAFAX. THE CATHODE RAY TUBE (LEFT) GENERATES THE "FLYING SPOT" OF LIGHT FOR SCANNING MESSAGES ON A FILM STRIP AS IT PASSES THROCGII THE INIT ON THE CENTER TABLE. MONITORING APPARATUS IS AT THE RIGHT. made for Ultrafax to serve the public. The demonstration proved the ability of Ultrafax to transmit at the speed of liKht—186,000 miles a second—a wide variety of graphic material includinjr charts, finger- prints, news and advertising layouts and items ranging from historical documents to complex atomic for- mulae and battle maps. A striking feature of the demon- stration came when the 1047-page novel "Gone With the Wind" was transmitted word for word in its entirety in about two minutes from the transmitter to the receiver in the Library of Congress. The Ultrafax system. RCA en- gineers reported, combines the ele- ments of television with the latest techni(iues in radio-relaying and high-speed jihotography. The sys- tem is a development of RCA Lab- oratories, in cooperation with the Eastman Kodak Company and the National Broadcasting Company. Engineers stated that the radio- television-photography combination forms the basis for a system of graphic communication which can be extended from city to city across the nation. During the demonstration, mes- sages, technical drawings and other material in foreign languages were among the numerous items trans- mitted by Ultrafax directly from the tower of the National Broad- casting Company's television station WNBW at the Wardman Park Hotel through the air to a receiving ter- minal on the stage of the Library of Congress, a distance of three miles. In a regular service the transmissions could be radio-relayed any distance across the country, using the commercial radio-relay system towers which now are being erected to establish national tele- vision networks. Guests at the Coolidge Auditori- um were welcomed by the Librarian of Congress, Dr. Luther H. Evans, who said: "I think it eminently fitting that this Library should be the host at a demonstration of this sort. As the principal institution of the nation charged with preserving and making available the printed records of man's communications with his fellows, we are profoundly interested in developments in the art and science of communication." THIS TINY RCA PHOTOTUBE TRANSFORMS LIGHT VARIATIONS OP ULTRAFAX MES- SAGES INTO RADIO SIGNALS. First Ultrajaxed Messages The first message ever publicly transmitted over the Ultrafax sys- tem was a handwritten letter by General SarnofT. congratulating the RCA scientists and engineers who created and developed this new method of radio communications and concluded: "May Ultrafax, as swift as light, open a new and use- ful service for mankind every- where." [4 RADIO AGE]