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RADIO BROADCAST
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Position
Distance from Monument
Curve Notation
No. 1
158'
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2
270'
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3
370'
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4
560'
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670'
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1400
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Wavelength in Meters.
Distortion of radio waves of various lengths caused by the Washington monument. The closer the location of the direction finder to the monument, the greater the distortion at any point. The distortion was greatest when the transmitting station used a wave length of 8oo meters
change in wave direction, signals were transmitted from the Bureau of Standards station at the Soldiers Home on a series of waves ranging from 400 to 1400 meters. The direction finder was placed successively at each of a number of positions at increasing distances from the monument. Measurements were made of the bending of the waves which was observed at each of these positions and for each of the wave lengths of transmission. It was found that while the bending of the waves was greater at the points nearer the monument, the distortion observed at a given location of the direction finder increased as the length of the transmitted wave was raised above 400 meters, until the wave length 800 meters was reached. At this wave length the angular distortion of the waves
v/as greatest, and when longer wave lengths were used by the transmitting station the distortion became very much less. It was therefore conclusively shown that the Washington monument was most effective in changing the direction of waves of 800 meters length. If the monument is considered as a simple radio antenna, it is foundthat the length of thewaves which it would send out if it were used as the antenna of a transmitting station would be approximately 800 meters. Thus it may be seen that the distortion caused b\' a given object is greatest when the waves which are passing by it are of the same length as those which would naturally be sent out by that object if it were used as the antenna of a transmitting station.