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Radio Broadcast
of attempting to receive radio photograms from a Paris station. The St. Louis Post-Dispatch and the New York World have closely followed and supported his work for many years. Using his system, these, two newspapers transmitted pictures with great success last December between St. Louis and New York City.
Those engaged in this work of phototelegraphy are racing with each other in their attempts to build up the first strong commercial foundation. It seems evident that the commercial field will be limited to one or two systems. It is quite possible that the ultimate system will be made up of contributions by the
many scientists now engaged in the work.
Millions of dollars have been spent for the development of phototelegraphy by those who appreciate its adaptability to handling communications of all kinds, whether it be photographs, drawings, script, or printed
Thirty-Seven Seconds for a Picture
The Cooley system, described in Mr. Henry's article, is capable of transmitting a five-byseven-inch half-tone photograph or a line drawing over a perfect wire line in thirtyseven seconds. There are other methods in present use which send photographs by radio and by wire, but the time consumed is from four to fifteen minutes. Speeding up the transmission involves very great technical problems. Notable among these are the systems of the Radio Corporation, the American Telephone and Telegraph Company, Marvin Ferree, Edouard Belin, and C. Francis Jenkins. Radio Broadcast is proud to present this story of Mr. Cooky's achievements, particularly because much of the development work was done in its own Laboratory.
Every sign points toward the early perfection of a commercially practicable system of phototelegraphy whose aid and influence in industry will be incalculable. Radio -Broadcast believes the technical attainments of Mr. Cooley 's system are of the greatest importance. Every reader who is interested in general scientific progress and all those engaged in developing radio and wire communication will read of what has been done with the deepest interest. — The Editor
matter. The speed at which typewritten messages may be transmitted over such a system is so great that one set of apparatus could handle all the messages going between New York and Boston, which are now being transmitted over thirteen lines of automatic printing telegraph. The adaptation of phototelegraphy to transoceanic radio communication will not only speed up the service but will tend greatly to reduce the unfortunate effect that static now has. In the present system, letters forming the words are coded into dots and dashes and sent very rapidly. A bad crash of static will completely destroy one or more words. Such a crash of static would only mar portions of letters from different words if the message were transmitted by phototelegraphy. To meet the keen competition of the cables, transoceanic radio companies must adapt some system that will insure reliability and at the same
MOUNT RAINIER, IN WASHINGTON Transmitted by the Cooley system. Much of the recent development work on this system which was started in Cambridge, Massachusetts, in 1922, was done in the Laboratory of Radio Broadcast at Garden City