This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1875 Excerpt: ...will not, answer. The new apparatus appears to
have the additional advantage of serving as a regulator, as it will
lower itself little by little as the discharge of the river
increases. The following is the description given by M. Carro in a
pamphlet published in 1870: "The apparatus which we propose, (Plate
13, Figs. 71, 72, 73, ) when reduced to its simplest form,
comprises two gates, which are connected ou top by hinges, and rest
on woodeu axles terminated by journals provided with rollers. The
gates roll upon rails placed parallel to the thread of the stream.
"Links fastened to the lower gate, below the middle, are also
fastened by a second articulation to fixed points distributed along
a right line parallel to the erest of the dam, and at right angles
to the current. A depression or chamber, from 1 foot H inches to 2
feet in depth, is prepared under the gates. "When the latter are
raised so as to form a dam they have the appearance of.an isosceles
triangle, (Fig. 71, ) whose apex is the crest of the weir. In order
to remove the obstacle which they present to the current they ant
made to slide, or rather to roll hi opposite directions, until they
lie down Hat on the sole, and only make, as it were, a flooring to
cover it. The t wo gates may therefore be considered as a single
one, jointed at a fracture in the middle, which works under the
pressure of the water when the dam its maneuvered. "If we consider
the gates in the position last examined, aud suppose that by a
special arrangement of valves, of which we will speak further on,
we put the chamber which they cover in communication with the upper
pool, the water introduced will exercise, by virtue of the
difference of level above aud below the dam, an under pressure
represented by thi...
|Country of origin:
United States Government Office
||246 x 189 x 28mm (L x W x T)
||Paperback - Trade
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