Annual report of the Board of Regents of the Smithsonian Institution . nected through the apparatuswith the frame of the airplane as a counterpoise. The length of thiswire was ordinarily 300 feet. A reel was provided for holding thiswire and a small weight was attached to the free end to cause it tounreel properly after the airplane left the ground. In order to reducethe attention required by the aviator in unreeling the antenna aspecial form of reel was devised with a centrifugal governor, whichlimited the unreeling speed to a value which prevented the weightfrom breaking the wire at the end
Annual report of the Board of Regents of the Smithsonian Institution . nected through the apparatuswith the frame of the airplane as a counterpoise. The length of thiswire was ordinarily 300 feet. A reel was provided for holding thiswire and a small weight was attached to the free end to cause it tounreel properly after the airplane left the ground. In order to reducethe attention required by the aviator in unreeling the antenna aspecial form of reel was devised with a centrifugal governor, whichlimited the unreeling speed to a value which prevented the weightfrom breaking the wire at the end of the unreeling process. The wirewhich was used was a soft braided copper wire made purposely oflow tensile strength, so that in case this wire became entangled withany obstruction during flight no particular strain would be put uponthe airplane structure before the antenna wire would break. The subject of radiation from airplane antennae has perhaps re-ceived less attention in proportion to its importance than almost Smithsonian Report, 1919.—Slaughter. Plate I. Transmitting and Receiving Unit.
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