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)
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. … forced through the pipe, T. The object of the air-chamber is to pro-duce, by means of the elasticity of the compressed air, a steady andcontinuous jet from the nozzle of the hose-pipe. Fire-engines were first employed in Egypt. Not only were suchengines used in early times, but the construction of…
Physics · Astronomy
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