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22
RADIO AGE for September, 1927
forerunner of 40 similar installations along the 8,234 miles of civil airways across the continent — was without formal exercises. The event, none the less impressive, was attended by Dr. George K. Burgess, Director of the Bureau of Standards ; Dr. J. H. Dellinger, Chief of the Radio Laboratory, and the technical staff responsible for the erection of the station. Appropriately signalizing the completion of this safety aid to flying, Dr. Burgess congratulated Haraden Pratt, actively in charge of the work, while the latter was winging his way far above the field in the test airplane. Using a radio telephone, located in a wooden shack on the outskirts of the College Park aviation field, the Director of the Bureau of Standards, in communicating with the airplane in flight, said: "Mr. Pratt, I hear you very plainly. I am interested in what you are doing out here and am pleased
to note that you have such a complete setup. Now, I must be going back to the Bureau to do some work. Goodbye."
Previously, Dr. Burgess had inspected the directive beacon for guiding aircraft in a zone of safety; he had donned a helmet and climbed aboard the radio-equipped flying craft; and then posed with Dr. Dellinger and the eight members of his technical staff for a photograph. The Director of the Bureau of Standards listened attentively to Dr. Dellinger as the latter related how the ignition system of this airplane had been shielded to minimize interference with radio communication ; how a satisfactory receiving set, with but one control, had been installed on this craft; and how, by means of a visual indicator, aviators may be directed in a zone of safety by slender beams of radio when consulting
a device on the instrument board of the airplane.
In the sense of being the genesis of radio aids to civilian aeronautics, the beacon station at College Park bears an analogy to the relation betwen the "Zero Milestone," in Washington, D. C, to the public highway system. The latter is the starting point in reckoning the mileage of the network of highways: This beacon station not only marks the starting point in developing radio aids to air navigation but the results of experiments now in progress will serve as a chart for erecting more than 40 other radio beacons along airways across the United States — for directing aircraft carrying passengers, postal matter, and express.
The directive beacons in transmitting a double-beam radio wave will set up a well-defined path or zone of safety for the airplane in flight. Established at intervals of
— Copyrighted by Harris and Ewing. The "Wireless Airplane" has arrived I Dr. George K. Burgess, Director of the Bureau of Standards, and Dr. J. HDellinger, Chief of the Radio Laboratory of the Bureau and other members of the laboratory staff, are seen examining the airplane at College Park, Maryland, which is guided exclusively by radio waves. The course of safety is automatically indicated by vari-colored lights flashed on the instrument board of the airplane.