. The panorama of science and art. , that the jet mayeasily be directed to any given point: the pipe G is also inpart made of leather, in order that a supply of water may bedrawn conveniently up from any accidental source. The pump was invented about one hundred and twenty yearsbefore the birth of Christ, by Ctesibius of Alexandria, the in-ventor of the organ, and the first example of it appears to havebeen a forcing pump. Improved Pump. Various attempts have been made to improve the construc-tion of pumps, and several of them have not been unsuccessful;a contrivance for converting the common
. The panorama of science and art. , that the jet mayeasily be directed to any given point: the pipe G is also inpart made of leather, in order that a supply of water may bedrawn conveniently up from any accidental source. The pump was invented about one hundred and twenty yearsbefore the birth of Christ, by Ctesibius of Alexandria, the in-ventor of the organ, and the first example of it appears to havebeen a forcing pump. Improved Pump. Various attempts have been made to improve the construc-tion of pumps, and several of them have not been unsuccessful;a contrivance for converting the common sucking pump into alifting pump, we shall first notice. It is represented by fig. 1,pi. Ill, -A-here AB is the working-barrel, which has a lateralpipe at C, connected with it: this lateral pipe turns up verti-cally, and is furnished with a valve aft K. The barrel AB isclosed by a strong plate at the top, containing a hole in itscentre, furnished with a collar of leathers. This collar tightly HTBMOSTATICS jmM HTMKAinLKCS. ruhli^lied bySenrsFixher. Caxtvn Livtrpovl. 18Z1. HYDROSTATICS AND HYDRAULICS. 117 Hydraulics. Improved pnmp.—De la Hires pump. embraces a straight, true, and polished piston rod M, and theleather being soaked in tallow, or some other unguent, is per-fectly air-tight. The piston S contains a valve, and there isanother valve atT; both of them opening upwards. Now sup-pose the piston S to be at the bottom of the working-barrel,when it is drawn up, it tends to compress the air above it, andthe valve in it remains shut by its own weight. But as the airwill not suffer compression, while a possibility of escape re-mains, it passes along the tube LC, and makes its egress bylifting the valve K. The space between the piston S and thevalve T, after a few strokes, becomes nearly a vacuum, thewater then rises from the well into the working-barrel, afterwhich the downward stroke of the rod M causes the water tolift the valve, and a column of it to get above the
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Keywords: ., bookcentury1800, bookdecade1, booksubjecttechnology, bookyear1823
