Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 131
ut even withthese all the air cannot be removed from the receiver.Theoretically, a perfect vacuum cannot be obtained in thisway, because at each stroke the air in the receiver is reduced only by a fraction of itself. 119 FiQ, 147.—Common form of air-pump. AB, cylin-drical barrel of pump ; H,… … Fig. 148.—An oil air-pump with twocylinders. 133. The Geryk or Oil Air-Pump. This is a very efficient pump recently 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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