. 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. 8.

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