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Encyclopedia Britannica - Main :: SAR-SCY |
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SCALE 300 . crooked for the purpose, causing them to revolve in a quadrant of a cylinder under the sill, known as the drum; and they can be readily lowered by cutting off the flow from the upper pool and putting the drum in communication with the lower pool, which connexions can be adjusted by see-saw sluice-gates, so as to put the upper paddles in any intermediate position between vertical and horizontal
weir
ordinary conditions, more than counterbalanced by the necessity of carrying the drum and its foundations
weir
Marne
2 Proc. Inst. C.E., vol. exxix., p. 258 and plate
Shutter weir. adopted for closing the timber passes alongside the needle weirs placed across the Main, with a single upper paddle 393 ft. long and 5 ft. 7 in. high in each case; and a still larger drum weir was erected about the same time for closing the navigable pass of a weir across the Spree at Charlottenburg, with an upper paddle 324 ft. long and 9 ft. high (fig. to).A peculiar and cheaper form of drum weir has been constructed across ten bays each 75 ft. wide on the Osage river near its confluence with the Missouri, where a hollow, wooden, cylindrical sector, stiffened inside by iron framing and revolving on an axis
part
lined with planking, having a radius
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