. Appleton's dictionary of machines, mechanics, engine-work, and engineering. The common forcing pump.—This pump, Fig. 3124, raises water from the well into the barrel on theprinciple of the suction pump just described, Fig. 3123, and then the pressure of the piston on thewater elevates it to any height that may be required. Here P is a solid piston working up and down in a barrel; V a valve, lifting upwards, placed at thetop of the pipe descending into the well; v a valve, also lifting upwards, placed in a pipe D, whichconveys the water to the cistern. In a descending stroke of the piston, th


. Appleton's dictionary of machines, mechanics, engine-work, and engineering. The common forcing pump.—This pump, Fig. 3124, raises water from the well into the barrel on theprinciple of the suction pump just described, Fig. 3123, and then the pressure of the piston on thewater elevates it to any height that may be required. Here P is a solid piston working up and down in a barrel; V a valve, lifting upwards, placed at thetop of the pipe descending into the well; v a valve, also lifting upwards, placed in a pipe D, whichconveys the water to the cistern. In a descending stroke of the piston, the valve V closes and the valve v opens, and the water, beingpressed before the piston, is forced up the pipe D to the higher level required; on the contrary, in anascending stroke, the valve v closes by the pressure of the external air and the water in the pipe D;the valve V opens, and the water rises into the barrel of the pump by the pressure of the atmosphereon the water in the well; and so on to any number of strokes. The forcing pump with an air-chamber.—This engi


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