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 . overcomes their adhesion to the woolen fibres. Boyssometimes stick pellets of tough clay to the end of a switch or flexible rod,and then drawing it quickly through the air, the force imparted to the balls sends them to their destination. If atube be substituted for the rod, andthe end that is held in the hand clo-sed, by a similar movement, ballsdropped or
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 . overcomes their adhesion to the woolen fibres. Boyssometimes stick pellets of tough clay to the end of a switch or flexible rod,and then drawing it quickly through the air, the force imparted to the balls sends them to their destination. If atube be substituted for the rod, andthe end that is held in the hand clo-sed, by a similar movement, ballsdropped or water poured into it,would be thrown forward in likemanner; and if by some arrange-ment the movement of the tube wasmade continuous, projected streamsof either balls or water might berendered constant: the centrifugalgun is a contrivance to accomplishthe one—the centrifugal pump theother. This pump generally consists oftubes, united in the form of a crossor letter T, placed perpendicularlyin the water to be raised. (No. 95.^The lower end is supported on a pivot; perforations are made to admiithe water, and just above them a valve to retain it when the pump is nolin moticm. The ends of the transverse part are bent downwards to dis-. No. 95. Centrifugal Pump. 230 Ccr*^ifugal Puynps. [Book II charge the water into a circular trousVi, over which thev turn. To chargfeit, the orifices may be closed by loosely inserting a cork into each, andthen filling the pumjj through an opening at the top which is then closedby a screw cap. A rapid rotary motion is imparted to the machine by apulley fixed on the axis and driven by a band, from a drum, &c. Thecentrifugal force thus communicated to the water in thearms or transverse tube, throws it out; and the atmo-sphere pushes up the perpendicular one fresh portionsto supply the place of those ejected. These pumps aresometimes made with a single arm like the letter L in-verted ; at others quite a number radiate from the up-right one. It has als
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Keywords: ., bookcentury1800, bookdecade1870, bookiddescriptiveh, bookyear1876
