. Elements of technology :. ARTS OF CONVEYING WATER. 315 desired, in a pipe a b, because the pressure communicated bythe downward stroke of the piston, is not dependent on thepressure of the atmosphere, but upon the direct force appliedto the piston. Plunger Pump.—A very effectual pump for raising alarge quantity of water to a small height, is shown in Fig. 8. Fig. D It is made by fitting two upright beams or plungers, A and B,of equal thickness throughout, into cavities nearly of the samesize, allowing them only room to move without friction, andconnecting the plungers together by a horiz
. Elements of technology :. ARTS OF CONVEYING WATER. 315 desired, in a pipe a b, because the pressure communicated bythe downward stroke of the piston, is not dependent on thepressure of the atmosphere, but upon the direct force appliedto the piston. Plunger Pump.—A very effectual pump for raising alarge quantity of water to a small height, is shown in Fig. 8. Fig. D It is made by fitting two upright beams or plungers, A and B,of equal thickness throughout, into cavities nearly of the samesize, allowing them only room to move without friction, andconnecting the plungers together by a horizontal beam movingon a pivot. The water being admitted, during the ascent ofeach plunger, by a large valve in the bottom of the cavity, atC and D ; it is forced, when the plunger descends, to escapethrough a second valve at E or F, in the side of the cavity,and to ascend by a wide pipe to the top of the machine. Theplungers ought not to be in any degree tapered, because in thiscase a great force would be unnecessarily consumed, whenthey descend, in throwing out the water, with great velo-city, from the interstice formed by their elevation. Thispump may be worked by a laborer walking backwards andforwards, either on the beam, or on a board suspended belowit. By means of an apparatus of this kind, described byProfessor Robison, an active man, loaded with a weight
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