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 . erabove its junction with thecylinder D. The horizontalpipe H connects B and D with the third opening of the cock. By turningthe plug of this cock, a communication is opened alternately between eachcylinder and the water in A. Thus when the water rushes into C, itdrives the piston before it to the extremity of the cylinder, and conse-quently the water that
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 . erabove its junction with thecylinder D. The horizontalpipe H connects B and D with the third opening of the cock. By turningthe plug of this cock, a communication is opened alternately between eachcylinder and the water in A. Thus when the water rushes into C, itdrives the piston before it to the extremity of the cylinder, and conse-quently the water that was previously in D is forced up the ascendingpipe B ; then the communication between A and C is cut off, (by turn-ing the cock) and that between A and D is opened, when the moved back to^vards F by the pressure of the column against thesmaller piston—the water previously in C escaping through an openingshown in front of the cock and runs to waste, while that which enters Dis necessarily forced up B at the next stroke of the pistons. Tlie cockwas opened and closed by levers, connected to the middle of the pistocrod, and was thus worked by the machine tscir 3y the air chamber,the discharge from B is rendered No. 161. Pressure Engine from Belidor. A. D. 1739. ^56 WestgartJis Pressure Engine. [lv(V)k III Suppose the water in A has a perpendicular fall of thly-fv)ur or thirty-five feet, and it were required to raise a portion of it to an eleAation ofseventy feet above F; it will be apparent that il both pistons were ofthe same diameter, such an object could not be acconipllshed by this ma-chine—for both cyUnders would virtually be but one—and so would thepistons; and the pressure of the column on both sides of the latter wouldbe equal. A column of water thirty-five feet hig;h presses on the base thatsustains it with a force of 15lbs. on every superficial mch; and one ofseventy feet high, with a force of SOlbs. on every inch—hence without regarding t
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Keywords: ., bookcentury1800, bookdecade1870, bookiddescriptiveh, bookyear1876
