Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 309
ng 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 recipro-cal motion of ^ ■= A the piston. B, piston; M,…
Mechanical movements
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