. The Cambridge course of elementary natural philosophy; being the demonstrations of the propositions in mechanics and hydrostatics in which those persons who are not candidates for honours are examined for the degree of d if the fluid press on theother side. [^Valves are of various forms,—a flap of leather (A)fastened at one edge,—a frustrum ^.of a cone (B) made of metal,—a —-j^f— ^_r~^_ sphere (C),—or a plate of metal(D) with an axis passing perpen- q •—-ndicularly through it. By any of ~\^y—these contrivances the flow of afluid upwards would be prevented only by the weight ofthe valve;
. The Cambridge course of elementary natural philosophy; being the demonstrations of the propositions in mechanics and hydrostatics in which those persons who are not candidates for honours are examined for the degree of d if the fluid press on theother side. [^Valves are of various forms,—a flap of leather (A)fastened at one edge,—a frustrum ^.of a cone (B) made of metal,—a —-j^f— ^_r~^_ sphere (C),—or a plate of metal(D) with an axis passing perpen- q •—-ndicularly through it. By any of ~\^y—these contrivances the flow of afluid upwards would be prevented only by the weight ofthe valve; but a rush of fluid from above would carry thevalve along with it, and keep the orifice which the valvefits completely closed. ■af* When the fluids employed are very rare,—like air orgas,-—the valves are generally made of flaps of oiled orvarnished silk, which being attached at two or three pointsto the surfaces in which the orifices are situated, are raisedby a very slight pressure, and so allow fluids of exceedinglysmall densities to pass under them.] (2) A Piston is a plug, mostly cylindrical, which, bymeans of a rod attached to it, can be made to play withina tube which it fits 62 HYDROSTATICS. 24. Prop. xv. To describe the construction ofthe common Air Pump and its operation. Description. The Air Pump consists of a glass vesselA, called the Receiver, made tofit a table BC so as to be airtight. A tube DE connects theReceiver with a cylinder EF,called the Barrel. At the bottomof the Barrel there is a valve E ^-opening upwards, and a piston F(also furnished with a valve opening upwards) plays withinthe Barrel. Operation. Let the piston F be at its highest point,and the instrument filled with air the same as that of thesurrounding atmosphere. When the piston is driven down, the air at first in thebarrel is condensed and its pressure therefore valve E is kept closed, and the valve in F beingpressed on the under surface more st
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Keywords: ., bookcentury1800, bookdecade1840, bookpub, booksubjecthydrostatics
