Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
lever, in the extremities of which, VY, are provided long barsor rods of wood (not shown), by means of which many men can workthe engine at the same time. Operation.—As one piston descends the other ascends. Supposingthe piston, F, to be forced down, the valve, E, will close, and the waterin this… … HYDRA ULICS. 133 the supply-pipe, as indicated by the long arrows. Reversing the mo-tion will reverse the valves. From the air-chamber the water, W, is Fig. 31.
Physics · Astronomy
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