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Show PLANES IDENTIFIED BY TUNE Discovery Made by American Provei 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 usually 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 la surrounding their capital with a shrapnel shrap-nel barrage whenever the German tiers ti-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 impossible to tell whether the approaching plane were German or British. His musical studies had trained tie American's hearing to a high degree, . however. He listened through the Instrument In-strument for several days while only British planes Hew 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. Be found that the German raiders are tuned in B-flat. Now the British a tion service keeps men about the capital capi-tal with their ears close to detectors, and whenever airplanes are beard vibrating in B-flat a barrage is ItM diutely ordered. |
