Italian Irrigation - 2 Angebote vergleichen

Von Händler/Antiquariat, BuySomeBooks [52360437], Las Vegas, NV, U.S.A.
This item is printed on demand. Paperback. 128 pages. Dimensions: 9.7in. x 7.4in. x 0.5in.This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1855 edition. Excerpt: . . . great floods are supplied, 1st, by six grand Weirs, the bodies of excellent masonry, the exterior slopes of masses of stone, sometimes with, at other times without, cement, paved on the upper surface, and provided with frameworks of wood on the sills to facilitate the construction of temporary dams of fascines, to retain, when necessary, the waters within the canal bed. The flanks are protected either by walls of masonry or by piles, and the whole of the works are carefully and solidly built. 2d, By twelve escapes, having a total number of 185 sluices, each from 2 to 2f feet in breadth, and managed by means similar to those in use on the canals of Piedmont, namely, an upright iron racket fixed to each sluice-gate, and a simple lever, which one man ordinarily applies to raise or close the gate. There is nothing worthy of special note in the construction of these escapes: they consist each of a solid mass of masonry in the foundations and body, with arched openings below, fitted with gates. The combined action of the weirs, and the regulating escapes, gives a perfect command over the supply under nearly all circumstances. The escape-channels are under charge of the government officers, but the waters passing through them are employed both for irrigation and machinery. Where the fall is excessive, impediments to the free escape of the waters may be of little consequence; but in India, we have decided objections to the employment of escapes as irrigating lines, considering their efficiency for their special purpose to be much impaired by such use. There are fourteen bridges on the canal, a provision for cross-communication much inferior to what we found in Piedmont. The great antiquity of the canal has rendered unnecessary those numerous. . . This item ships from La Vergne,TN.

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Richard Baird Smith, Books, History, Italian Irrigation, This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1855 edition. Excerpt: ... great floods are supplied, 1st, by six grand Weirs, the bodies of excellent masonry, the exterior slopes of masses of stone, sometimes with, at other times without, cement, paved on the upper surface, and provided with frameworks of wood on the sills to facilitate the construction of temporary dams of fascines, to retain, when necessary, the waters within the canal bed. The flanks are protected either by walls of masonry or by piles, and the whole of the works are carefully and solidly built. 2d, By twelve escapes, having a total number of 185 sluices, each from 2 to 2f feet in breadth, and managed by means similar to those in use on the canals of Piedmont, namely, an upright iron racket fixed to each sluice-gate, and a simple lever, which one man ordinarily applies to raise or close the gate. There is nothing worthy of special note in the construction of these escapes: they consist each of a solid mass of masonry in the foundations and body, with arched openings below, fitted with gates. The combined action of the weirs, and the regulating escapes, gives a perfect command over the supply under nearly all circumstances. The escape-channels are under charge of the government officers, but the waters passing through them are employed both for irrigation and machinery. Where the fall is excessive, impediments to the free escape of the waters may be of little consequence; but in India, we have decided objections to the employment of escapes as irrigating lines, considering their efficiency for their special purpose to be much impaired by such use. There are fourteen bridges on the canal, a provision for cross-communication much inferior to what we found in Piedmont. The great antiquity of the canal has rendered unnecessary those numerous...