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A New Method of Transmitting Pictures by Wire or Radio
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the negative, still wet from the developing solution (if utmost speed is desired) in the machine, and, in the course of a minute or two, transmit it to the photographer's headquarters. And, wonderful though it may seem, the photographer may send it to be received as either a negative or a positive. He may also send a print or even a clipping from a magazine or newspaper and have the replica in the hands of the editor within a few minutes after completing his telephone connection. Since this work may be done acoustically, there is no need of any electrical connection between the photo-transmitter and the telephone.
ONE PICTURE — EVERY HALF MINUTE
MR. COOLEY has not lost sight of the fact that 1200 impulses per second is about the maximum number that can be transmitted over a commercial telephone line. This limits the speed of transmission to about seventeen square inches per minute if the picture is to be printed out with sixty-five dots per inch, this being standard for newspaper prints. The speed might be increased through the use of high quality transmission lines such as are used for carrying programs from a studio
to a broadcast station. In such lines the circuits are so arranged that frequencies up to 4000 cycles per second are passed. At the 4000 impulse rate, only thirty-seven seconds would be required to send a five-by-seven-inch picture.
Before this copy of Radio Broadcast reaches the reader, it is confidentially expected that the necessary alterations in the present model will be made, so that the most detailed photograph with all its half-tone shadings can be transmitted over any telephone or radio circuit that is capable of transmitting intelligible speech. There is every hope for the early detailed announcement of this phototelegraphic system that is fundamentally new and novel in its transmission and receiving methods.
The quality of the photographs transmitted by this system can be made especially good for magazine use. By increasing the speed of transmission, photographs can be sent at a greater speed, for use in newspapers. In its final form, the apparatus will be extremely simple, relatively inexpensive, and equally adaptable for line or radio transmission.
In connection with this work, a very important new use of the vacuum tube has been discovered and a very plausible theory has
THE ORIGINAL — AND THE TELEGRAPHED PHOTOGRAPH
Sent from New York to Chicago by the "Telepix" system now in use by the Chicago Tribune and the New York Daily News. The cut on the right is a print of the wired picture after it had been slightly retouched. At present, wired photography is decidedly expensive and too slow for general commercial use