Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 482
SCULPTOR AT WORK WITH PNEUMATIC CHISEL,Hughes Granite and Marble Co., Clyde, Ohio. A DEBT TO DENTISTRY 419 touch. Pneumatic hammers are of two kinds: Valveless hammersin which the piston is the hammer, opening and shutting the inletand exhaust parts; and valve hammers, in which there is a dis-tinct… … •^V/Attsr Haeseler air-hammer.Ingersoll-Rand Co., New York. stroke, and are chiefly used in caulking and chipping. Some ofthem yield as many as 250 strokes per minute. Valve hammersdo not move at this high pace, rarely exceeding thirty-five strokesper minute, but each stroke is comparatively long…
Inventions · Inventors
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