Overshot wheel

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Related to Overshot wheel: undershot wheel
a vertical water wheel, the circumference of which is covered with cavities or buckets, and which is turned by water which shoots over the top of it, filling the buckets on the farther side and acting chiefly by its weight.

See also: Overshot

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The overshot wheel's efficiency (how much of the energy in the moving water was used) was rated at 65 to 70 percent.
The overshot wheel was 60 feet in diameter, 22 feet wide and produced 1,200 hp.