. Farm machinery and farm motors. FIG. 194—SECTION OF A ROTARY PUMP SHOWING PISTONS for low lifts at least, and will handle dirty water better mthan any other kind of pump. Centrifugal pumps are. 1 FIG. 195—CENTRIFUGAL PUMP made with either a vertical or a horizontal shaft. Thepumps with a vertical shaft are called vertical pumps and PUMPING MACHINERY 273 may be placed in wells of small diameter. This class ofpump gives but little suction and works the best whenimmersed in the water. 388. The hydraulic ram.—Where a fall of water ofsufficient head and volume is at hand, it may be used toelevate
. Farm machinery and farm motors. FIG. 194—SECTION OF A ROTARY PUMP SHOWING PISTONS for low lifts at least, and will handle dirty water better mthan any other kind of pump. Centrifugal pumps are. 1 FIG. 195—CENTRIFUGAL PUMP made with either a vertical or a horizontal shaft. Thepumps with a vertical shaft are called vertical pumps and PUMPING MACHINERY 273 may be placed in wells of small diameter. This class ofpump gives but little suction and works the best whenimmersed in the water. 388. The hydraulic ram.—Where a fall of water ofsufficient head and volume is at hand, it may be used toelevate a portion of the flow of water to a higher eleva-tion. The action of a hydraulic ram depends upon theintermittent flow of a stream of water whose momentumwhen brought to rest is used in forcing a smaller streamto higher elevation. The ram consists essentially of(a) a drive pipe leading the water from an elevated sourceto the ram; (b) a valve which automatically shuts ofif theflow of water from the drive pipe through the overflow,after sufficient momentum has been gathered by thewater; (c) an air chamber in which air is compressed bythe moving water in the drive pipe in coming to rest
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