Word: fogbanks
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Dates: during 1930-1930
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...transpired, might be a rocket on which Mr. Edison was already experimenting. He has devised a day-or-night rocket to explode at 4,000 ft. and hoped to adjust the explosion to give an incoming pilot an accurate idea of the airport location and the height of the fogbank. Another line of experimentation, he suggested, might be a sound-signal to the fog-barred pilot, "a distinctive sound . . . which would cut through the noise of the motor and reach the aviator...
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