A descriptive and historical account of hydraulic and other machines for raising water, ancient and modern : with observations on various subjects connected with the mechanic arts: including the progressive development of the steam engine . No. 116. No. 117. Siugle-Valve Forcing Puiups. Chap. 3.] Ooutvivn Forcing Pump. 263. No. 118. Common Foicing Pump. The ordinary forcing pump has two valves, as in the annexed figure,which repie«enta it as generally made. The cylinder is placed above thesurface of tha \vr tor to be raised, and consequently is charged by the pres-sure of the d*jnosj)here ; th
A descriptive and historical account of hydraulic and other machines for raising water, ancient and modern : with observations on various subjects connected with the mechanic arts: including the progressive development of the steam engine . No. 116. No. 117. Siugle-Valve Forcing Puiups. Chap. 3.] Ooutvivn Forcing Pump. 263. No. 118. Common Foicing Pump. The ordinary forcing pump has two valves, as in the annexed figure,which repie«enta it as generally made. The cylinder is placed above thesurface of tha \vr tor to be raised, and consequently is charged by the pres-sure of the d*jnosj)here ; the machine, therefore, is a compound one, dif-fering from that last described, whichis purely a forcing pump, the water en-tering its cylinder by gravity action of the machine now underconsideration is similar to thai of thesyringe: when the piston is raised theair in the pipe below the cylin ier rushesthrough the valve and is expelled onthe descent of the piston through theother valve in the ascending or dis-charging pipe ; and on a repetition ofthe strokes of the piston, waer rises inthe suction pipe, enters the cylinder,and is expelled in the like of this kind are sornetimes placedin the yards of dwellirig houses, tliesuction pipe extending into a well, andthe ascending one to a cistern in
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