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Encyclopedia Britannica



SCALE 200

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

Encyclopedia Britannica - Main :: SAR-SCY
SCALE 200 .
or by pulling the props clear of their shoes by chains fastened to the bottom of the shutters; the unsupported trestles and shutters fall flat on the apron on the top of the props, as shown by dotted lines in fig. 9. The weir is raised again by pulling up the shutters to a
horizontal
  position by their bottom chains from a
special
  boat, or from a foot-
bridge
  on movable frames, together with their trestles and the props which are replaced in their shoes. The discharge at the weir whilst it is raised is effected either by partially tipping some of the shutters by chains from a foot-
bridge
 , or by opening butterfly valves resembling small shutters in the upper panels of the shutters. The addition of a foot-bridge greatly facilitates the raising and lowering of these shutter weirs, and also aids the regulation of the discharge; but it renders this form of weir much more costly than the
ordinary
 
frame
  weir, and where large quantities of
drift
  come down with sudden floods, the frames of the bridge are liable to be carried away, and therefore boats must be relied on for working the weir.
The drum weirs erected across shallow, regulating passes on the river Marne in 18571867 comprise a
series
  of upper and under
wrought-iron paddles, which can make a
quarter
  of a Drum
revolution round a central
axis
  laid along the sill of the weir. weir. The straight, upper paddles form the weir, and can
be raised against the stream by making the water from the upper pool
press
  upon the upper faces of the slightly larger lower paddles,
e-v


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