Annual report of the Board of Regents of the Smithsonian Institution . Receiving Unit (Open). Smithsonian Report, 1919.—Slaughter. Plate Complete Transmitting and Receiving Set. WIRELESS TELEPHONY—SLAUGHTER. 189 any other phase of airplane wireless telephony. This is partly dueto the fact that the form of antenna above described possesses ex-tremely efficient radiating properties and partly to the fact thatinvestigations of the subject require very extensive and painstakingmeasurements involving actual nights of airplanes. The investiga-tions conducted during the war, however, included a l
Annual report of the Board of Regents of the Smithsonian Institution . Receiving Unit (Open). Smithsonian Report, 1919.—Slaughter. Plate Complete Transmitting and Receiving Set. WIRELESS TELEPHONY—SLAUGHTER. 189 any other phase of airplane wireless telephony. This is partly dueto the fact that the form of antenna above described possesses ex-tremely efficient radiating properties and partly to the fact thatinvestigations of the subject require very extensive and painstakingmeasurements involving actual nights of airplanes. The investiga-tions conducted during the war, however, included a large number oftests of various types of antenna, the principal-object of which wasto evolve a substitute for the long trailing wire which would be betteradapted for use on airplanes engaged in acrobatic flying. Obviouslythe movements of an airplane were somewhat restricted by the useof this type of antenna. Without indicating in detail any of the alternative types of an-tenna which were developed and used it may be stated there are anumber of forms of airplane antenna which offer considerable promiseof complying with the radiation r
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