Undershot Wheel

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“Thus constructed, this wheel moves equally well whether the water acts on one or the other side of the boards, and hence is employed for tide wheels, which turn in one direction when the tide is going out, and in the other when it is coming in.” -Comstock 1850

Source

J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 134

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