. The Ontario high school physics. troke a partial vacuum is formedin the barrel, and the air in thesuction tube expands and passesup through the valve Vy Asthe plunger is pushed down theair is foiced out through thevalve Fg. The pump, therefore,during the first strokes acts asan air-pump. As in the suction-pump, the water is forced up intothe suction pipe by the pressureof the air on the surface of thewater in the reservoir. When itenters tlie barrel it is forced bythe plunger at each down-strokethrough the valve V^ into thedischarge pipe. The flow willobviously be intermittent, as theoutflow
. The Ontario high school physics. troke a partial vacuum is formedin the barrel, and the air in thesuction tube expands and passesup through the valve Vy Asthe plunger is pushed down theair is foiced out through thevalve Fg. The pump, therefore,during the first strokes acts asan air-pump. As in the suction-pump, the water is forced up intothe suction pipe by the pressureof the air on the surface of thewater in the reservoir. When itenters tlie barrel it is forced bythe plunger at each down-strokethrough the valve V^ into thedischarge pipe. The flow willobviously be intermittent, as theoutflow takes place only as the plunger is descending. Toproduce a continuous, stream, and to lessen the shock on thepipe, an air chamber, F is often inserted in the discharge the water enters this chamber it rises above the outletG which is somewhat smaller than the inlet, and compressesthe air in the chamber. As the plunger is ascending thepressure of the inclosed air forces the water out of thechamber in a continuous 158—Force-pump. AB, cylindricalbarrel; BC, suction-pipe ; P, piston ; F,air chamber ; V,, valve in suction-pipe ;Tj, valve in outlet pipe; G, disnharg:epipe ; R, reservoir from which water istaken. 128 APPLICATIONS OF THE LAWS OF GASES 144. Double Action Force-Pump. In Fig. 159 is shownthe construction of tlie double-action force-pump. When the piston is moved forward in thedirection of the arrow, water isdrawn into the back of the cylin-der through the valve Fj, whilethe water in front of the pistonis forced out through the valve V^.On the backward stroke water isdrawn in through the valve Fgand is forced out through thevalve V^. Pumps of this type areused as fire engines, or for anypurposes for which a large con-tinuous stream of water is required. They are usuallyworked by steam or other motive power.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
