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Show PLANES IDENTIFIED BY TUNE Discovery Made by American Proves Extremely Valuable to British Aviation Service. Air raids on London are no longer the sure-fire stuff for heartening the German people that they once were. Lately the raiders uoually find that they can raid up to the English coast and then have to raid right back home again. A young American is given credit for the success of the British in 6urroundlng their capital with a shrapnel shrap-nel barrage whenever the German flyers fly-ers approach. A Brooklyn youth who had enlisted In the British aviation service was assigned as-signed to test out an airplane detector which was expected to discover the approach ap-proach of airplanes before they could be heard, so to speak, with the naked eye. No one expected that the device would make It possible to tell whether the approaching plane were Germaa or British. His musical studies had trained the American's hearing to a high degree, kowever. He listened through the instrument in-strument for several days while on'y British planes flew within its range. Then he heard a different note. A German Ger-man raiding squadron was approaching. approach-ing. ' The American had discovered that British planes hum in G-mlnor. He found that the German raiders are tuned in B-flat. Now the British aviation avia-tion service keeps men about the capital capi-tal with their ears close to detectors, find whenever airplanes are heard vibrating in B-flat a barrage Is Immediately Imme-diately ordered. |