Word: muffler
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Much experimentation but little actual practice has been made with mufflers for airplanes. One reason: engine mufflers are ordinarily of only partial value because as much as half the noise of an airplane is made by the whirling propeller (TIME, Oct. 27, 1930). But geared en- gines turn big, high-pitched propellers at low speeds. In such engines propeller noise is comparatively slight. Last week Eastern Air Transport, whose Condor biplanes are powered by geared Conqueror engines, adopted a muffler which was said to reduce engine noise by 70% without loss of power. The muffler, developed by the company...
...could not stand the idea of drawing another frock coat, he would paint himself again, accenting his pixie face, dressing himself in outlandish costumes. There exist striking self-portraits of Billy Orps in a succession of funny hats, in racing silks as a jockey, as a major in his muffler and trench helmet, as a wildfowler, as a painter with a dustcloth wrapped round his head, in his bathrobe...
...Catapult Muffler...
...gradual thrust, less of a jerk. But the powder blast sometimes causes accidents, once blew a seaman overboard, makes as much noise as a 5-inch gun. Last week the Navy Bureau of Aeronautics ordered a newly designed "blast reducer" for all explosion-catapults. Built somewhat like an automobile muffler ?a cylindrical chamber perforated with many small holes?the device confines the blast, safeguards its kick, muffles its bark...
...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...