Merchant, F. W. (Francis Walter), 1855-1937, Fessenden, Cortez, b. 1852 · Toronto : Copp, Clark · leaf 132
asin the pump for withdrawing the airfrom the receiver. 1. Explain the action of the valves B and Don (a) the down-stroke, (b) the up-stroke, andshow how the density of the air in the vessel C is increased by theworking of the pump. 2. Obtain a small bicycle pump, take it apart and study… … Fig. 91. 124 PHYSICAL SCIENCE. other end of which is placed in the water to be drawn.A piston D, in which there is a valve opening upward, is
Physics
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