Mechanical movements, powers, devices and appliances; (1903)
Hiscox, Gardner Dexter, 1822?-1908 · New York, The N.W. Henley & co. · leaf 307
ston.* Sergeant model. 1200. TAPPET VALVE, for a rock drill. 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. jM~^^\ 1201. ROCK DRILL, with balanced piston valve,… … t^dZ2j<y4-j^^W^^
Mechanical movements
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