Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 131
It is evident, therefore,that a partial vacuum only can be obtained with a pumpof tliis kind. To secure more complete exhaustion, pumpsin which the valves are opened and closed automatically bythe motion of the piston are frequently used, but even withthese all the air cannot be removed from the… … Fig. 148.—An oil air-pump with twocylinders. 133. The Geryk or Oil Air-Pump. This is a very efficientpump recentl}^ invented but widely used. (Figs. 148,149.) Its action is as follows. The pistonJ, made air-tight by the leatherwasher G and by being coveredwith oil, moves up-and-down inthe barrel.…
Physics
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