Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 95
gthe valve in the piston. The air in the receiver is then expandedto till the space of the receiver and the cylinder. When the pis-ton reaches the top and is again dejDressed, the valves at the bottomand top of the cylinder close. The air is thus prevented fromreturning to the receiver, and is soon… … 301. The Rotary Air Pump. Several improvements havebeen made in the air pump late-ly which have been combinedin the Rotary Air Pump, Fig.109. In this, the motive poweris applied to a crank and heavybalance wheel, so allowing ofvery rapid exhaustion. Besides,the valves are made to workautomatically…
Physics
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