Plate XCIX.—Hydrostatics.—Fig. 1. A quadruple pump-mill for raising water.details

[Picture: Plate XCIX.—Hydrostatics.—Fig. 1. A quadruple pump-mill for raising water.]
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Plate XCIX.—Hydrostatics.—Fig. 1. A quadruple pump-mill for raising water.

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The height of modern technology in 1771: a super-efficient pump powered by a water wheel!

The ngine is represented in Plate 99. fig. 1. In which ABCD is a wheel, turned by water according to the order of the letters. On the horizontal axis are four small wheels, toothed almost half round; and the parts of their edges on which there are no teeth are cut down so as to be even with the bottoms of the teeth where they stand.

The teeth of these four wheels take alternately into

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