Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 308
ders on the piston. Sergeant model. MINING. 299 … 1203. COAL-CUTTING MACHINE, Ingersoll-Sergeant model. The piston and drill rod are automatically operated by thealternating motion of two piston valves. Operated by compressedair, and only has to be held against the coal wall to under-cut, whenthe face can be broken down.
Mechanical movements
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