Word: radiocompass
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Dates: during 1930-1939
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...incoming liner steering for a light-ship finds its direction by rotating the loop antenna of the radiocompass. The beacon is strongest when the loop is parallel to the direction of the signals, weakest when it is at right angles. Since sound travels much more slowly through water than radio waves through air, the distance of the lightship can be computed by noting the time between reception of the beacon and oscillograph signals...
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