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530 DOCK ENGINEERING.
Power of Sluice Machines.—In estimating the power required for working
clough paddles, there are two factors to be taken into considération—viz.,
(1) the weight of the paddle itself, and (2) the working friction against the
faces of the clough jambs. This latter is greatest at starting and will
diminish as the paddle rises. Tlie maximum effect can be found by calcu-
lating the pressure against the face of the paddle, due to the initial head
of water, and multiplying by a coefficient of friction.
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Figs. 531 and 532.—Hydraulic Capstan.
Figs. 533 and 534. —Hydraulic Capstan.
The following are values for the latter when the surfaces in contact are
wet or dry :—
Wet. Dry.
Wood on wood, •68 •50
,, ,, stone, ■70 •60
„ ,, metal, . ■65 •60
Metal . . •15 •18