. The elements of railroad engineering . Fig. 307. g great depths to the earths surface; hence, g a very long piston rod is necessary. In the S lifting pump shown in Fig. 206 the water is raised from a point a few feet below the PNEUMATICS. 439 earths surface to a point considerably higher. This re-quires the piston rod to move through a stufifing-box, asshown at S, and also necessitates the rod being round, inorder that the water may not leak out. 1081. Force Pumps.—The force pump differs fromthe lifting pump in several important particulars, butchiefly in the fact that the piston is solid; t
. The elements of railroad engineering . Fig. 307. g great depths to the earths surface; hence, g a very long piston rod is necessary. In the S lifting pump shown in Fig. 206 the water is raised from a point a few feet below the PNEUMATICS. 439 earths surface to a point considerably higher. This re-quires the piston rod to move through a stufifing-box, asshown at S, and also necessitates the rod being round, inorder that the water may not leak out. 1081. Force Pumps.—The force pump differs fromthe lifting pump in several important particulars, butchiefly in the fact that the piston is solid; that is, it has novalves. A section of a suction and force pump is shown inFig. 208. The water is drawn up the suction pipe as before,when the piston rises; but when the piston reverses, thepressure on the water caused by the descent of the piston
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
