water wheel

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Johnnie S


Date added:

August 19, 2013







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In the 1st cent. &BC; a horizontal shaft came into use; the wheel attached to it had radial vanes around its edge. Among the early forms of this wheel are the overshot wheel, used where water falls from a height, striking the vanes from above; the breast wheel, employed where the height of the water is less than the height of the wheel so that the water strikes the wheel about midway; and the undershot wheel, usable where the water flows more or less on a level but with a swift current and strikes the vanes on the under part of the wheel...
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One of the first uses of the steam engine was to drive a pump that raised water into a millpond whose spillway drove a water wheel. Today the water wheel has been largely replaced by the turbine. Waterwheels have been used since ancient times to grind corn and also to raise water. The great waterwheels of Hama in Syria have raised water for over a thousand years...
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