Word: mufflers
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Dates: during 1930-1939
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...Catapult Muffler...
Puffing upon one cigaret after another, Miss Jones directed mechanics in attaching to the Cirrus engine of a Moth biplane a muffler of her own invention. As the plane sped along the runway and over the hangars there were noises-of thrumming propeller, snapping pistons, vibrating metal-but there was no bark of exhaust...
Miss Jones's device, about 18 in. long, outwardly resembles an ordinary Ford automobile muffler. Inside is a series of small "pinwheels" which retard the speed of the exhaust gases-"chewing up" the sound waves without creating excessive back pressure upon the engine. (The latter factor, involving loss of power, has been the principal drawback to most attempts at muffling.) The pilot who tested the Jones muffler in flight said the engine lost none of its normal speed-1,900 r.p.m...
Miss Jones, head of El Dorado Inventions, has been manufacturing automobile mufflers since 1913 when her ears were first assailed by an unmuzzled Ford in a Moline garage. Her idea for the airplane muffler she gleaned from contemplation of a grease-vapor exhaler set into the wall above a restaurant stove. Another of her products is a 2-lb. electric flatiron. Fiftyish, Miss Jones believes in the ability of women over 40, substitutes them for men at workbenches in her machine shops whenever possible...
...detail, the Jones muffler is not entirely new in principle. Among many other efforts, one like hers was created by one William Deal and exhibited in the 1929 Aeronautical Exposition of the American Legion in Manhattan by Curran Machine Works of Long Island City. Other methods under experiment are:1) to reduce the speed of the exhaust gases by rapid cooling and 2) employment of sound-absorbing material in the muffler -with the corresponding danger of the material catching fire...