. The Family tutor . NATURAL PHILOSOPHY. 127 jises from the reservoir, R, and enters the barrel. During the downward movementof the piston the valve, v, shuts, and the water passes by a channel round m, throughthe lateral pipe, M T M N, into the air-vessel, K K. The entrance to this air-vessel at P,. covered with is closed by a valve, a, and there proceeds from it a vertical tube, H G, open at bothends. ^After a few movements of the piston, the lower end, I, of this tube becomeswater, and any further quantity now thrown in compresses the airin the space, H G, which, exerting its elastic force,
. The Family tutor . NATURAL PHILOSOPHY. 127 jises from the reservoir, R, and enters the barrel. During the downward movementof the piston the valve, v, shuts, and the water passes by a channel round m, throughthe lateral pipe, M T M N, into the air-vessel, K K. The entrance to this air-vessel at P,. covered with is closed by a valve, a, and there proceeds from it a vertical tube, H G, open at bothends. ^After a few movements of the piston, the lower end, I, of this tube becomeswater, and any further quantity now thrown in compresses the airin the space, H G, which, exerting its elastic force,drives out the water in a continuous jet, S. The reci-procating motion of the piston may, therefore, bemade to give rise to a continuous and unintermittingstream by the aid of the air-vessel, K K. Among other hydraulic machines may be mentionedVeras pump, more, however, from its peculiar con-struction than for any real value it possesses. It con-sists of a pair of pulleys, over which a rope is madeto run rapidly ; the lower one is immersed in the waterto be raised. By adhesion a portion of the water fol-lows the rope in its movements, and is dischargedinto a receptacle placed above. (Fig- 73.) The chain-pump consists of a series of flat plates, d,held together by pieces of metal, so arranged
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Keywords: ., bookcentury1800, bookdecade1850, bookpublisherlondo, bookyear1851
