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Encyclopedia Britannica



SCALE

This article appears in Volume V28, Page 498 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: SAR-SCY
SCALE 'M.
up the curtains, and then lifting the hinged frames to a
horizontal
  position under the overhead
bridge
  by means of chains worked by a winch on the
bridge
 . This
system
 , which has been employed for the lowest
weir
  on the Moldau, and for a
weir
  at the upper end of the
Danube
 
canal
  near Vienna to shut out floods and floating ice, as well as on the Seine, possesses the merits of raising all the movable parts of the weir out of water in flood-
time
 , and rendering the working of the weir very safe and easy. On the other hand, it involves the expense of a wide foot-bridge for raising the frames, and wide and high river piers, especially for the navigable passes where the bridge has to be raised high enough to afford the regulation headway for vessels at the highest navigable flood-level (fig. 7), so that its adoption should be restricted to positions where the conditions are quite exceptional.


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