Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 146
ple. \\ hen the pump is at rest, both valves aand b are closed by their own weight. Imagine a down-stroke of the pump rod. The chamber A is filled with air,which opens the valve a and escapes. Now picture an up-stroke. The valve a closes, and as the piston rises, increas-ing the volume of the space… … Fig. 77. Cucumber pump. 128 PHYSICS is by the lower gateway b, and if the lower end of the pumptube dips into water the air will drive the water before itso long as its weight is less than the pressure to be exertedby the air. When enough air from the lower tube has beenpushed up through b to make…
Physics
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