Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 307
ll. The ports are radial,and are opened and closed by theswing of the valve on its centre.The valve is thrown by the shoul- ders on the piston, striking the valve arms. Sergeant model. 1201. ROCK DRILL, with balanced piston valve, which isthrown by compressed air inlet through ports opened by the…
Mechanical movements
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