AERIAL EAVESDROPPERS
PIOTS CAN HEAR AT GREAT HEIGHTS If you have anything disparaging to say about an aviator, it would be best first to scan the sky to see -whether he is eavesdropping. Sounds can be heard at greater distances vertically than horizontally. While the engine of an airplane is running, it is perfectly safe to talk loudly, but if the aviator happens to be in the car of a balloon or in a plane with the engine shut off he could hear voices nearly a half-mile away. The bark of a dog has been heard at 5,900 feet; the crowing of a cock or the report of a rifle, a mile above the ground. The noise of a train can be heard at 8,000 feet; the locomotive whistle two miles; a man’s voice can be heard at 1,600; a cricket’s chirp at 2,500; the croak of frogs at 3,000; a rolling cart at 3,255, and the beat of a drum at 4,550 feet.
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Bibliographic details
Sun (Auckland), Volume II, Issue 461, 17 September 1928, Page 12
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164AERIAL EAVESDROPPERS Sun (Auckland), Volume II, Issue 461, 17 September 1928, Page 12
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