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A New Method of Transmitting Pictures by Wire or Radio 23
CHARLES EVANS HUGHES
Former Secretary of State, whose photograph was sent across the Atlantic by the Ranger-Radio Corporation of America "photoradiogram" system. The Ranger method, while used in this instance on a high power, long wavelength radio circuit, can be used on a wire line equally well
communication channels is much lower than the ones required for the dot system as used by the American Telephone and Telegraph Company, Jenkins, Belin, and others. The Radio Corporation sent pictures across the Atlantic in twenty minutes by the dot-dash method. An hour or more is required to transmit a Telepix picture over a telegraph wire, but these pictures are larger and contain more detail than those handled by the Radio Corporation. The American Telephone and Telegraph Company have transmitted pictures of considerable detail in four or five minutes, but special wires were required. The cost of the communication channels used is an important factor that will determine the commercial value of any system. In some cases the high cost may be offset by the great capacity of the apparatus operating over the channel.
When a system of phototelegraphy goes into commercial use, there will probably be separate rates for printed matter and photo
graphs. This is because the adjustments of the apparatus can remain fixed when handling black and white subjects while the transmitting of a photograph would require special attention so that the tones and shades may be properly reproduced at the receiving station. A picture having little contrast and printed on sepia paper would require adjustments of the apparatus entirely different from one having contrast and printed on a glossy paper.
THE STORY OF THE COOLEY SYSTEM
THE Cooley system, which has never been made public, incorporates more contributions to the art than does that of any other inventor. This development is an outgrowth of
VERITABLE " RADIO WRITING"
A sample of writing of Doctor Hainsworth, one of the inventors of the Cooley-Hainsworth phototeleIgraph transmitting system. This was sent ex' perimentally in Cambridge in 1922