Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 480
dance instead of muscular drudgery. Air drills areused in mines, wells, tunnels, and rock foundations; at will themechanism impels a hammer instead of a drill. Air riveters buildships and bridges, as well as fasten together the comparativelysmall plates of boilers and fire-boxes. With a little… … 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…
Inventions · Inventors
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