Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 950
* From Clarks Kales, Tables, and Data, &c. WATER-WHEELS. 915 suitable velocity of .floats is 4£ ft. per second; the velocity should not exceed the limits of from 3 to6^ ft. per second. The depth of water over the sliding gate should be from 8 to 10 in. measured 4244. … from still water. The diameter should be at least 11£ ft.; it is seldom more than from 20 to 23 ft.These diameters are suitable for falls of from 3 to 6 or to even 8 ft. The distance apart of thebuckets should be 1£ to 1| time the head over the gate for slow wheels ; for quick wheels, a little 4245.
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