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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)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 134

An illustration from 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, leaf 134
177. Figure 22.— Double cog-wheel rotary pump.— This is one of the oldest rotary steam-engines, but now principally HYDRAULICS. 127 employed as a suction and force pump, for wliicli purpose it is a power-ful machine. It consists of two cog-wheels, the teeth working water-tight intoeach other, and… … to the shaft of one of the wheels. As one wheel turns the other, theyrevolve in opposite directions. Operation.—As the Avheels revolve (in the direction of the arrows),a portion of the water below is carried between their teeth and thecase, as at N and L, around to the upper side, and as it cannot…

Physics · Astronomy

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