The Ten Books on Architecture, 10.5.1

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Of Another Sort of Tympanum, and of Water Mills

5Wheels on rivers are constructed upon the same principles as those just described. Round their circumference are fixed paddles, which, when acted upon by the force of the current, drive the wheel round, receive the water in the buckets, and carry it to the top with the aid of treading; thus by the mere impulse of the stream supplying what is required.

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