Supplement to Spons' Dictionary of Engineering; Civil, Mechanical, Military, and Naval Volume 1

Supplement to Spons' Dictionary of Engineering; Civil, Mechanical, Military, and Naval Volume 1

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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. 1879 edition. Excerpt: ... 32 ft. by 14J ft., weighed 14 tons; whereas at Kehl, a eaisson 23ft. by 19 ft weighed 34 tons, at reorient, 39) ft. by Hi ft. weighed 27) tons, and at Riga, til) ft by lti ft. weighed 45) tons. The height of the ehamber of exeavation sheuld be about 8 ft. 10 in. Frequently the eofferdam easing is of iron, whieh proteets the newly built masoury from frietion; and the upper portion of the easing ean be removed. At Lorient there were two air loeks, Figs. 531, 532, eaeh eonneeted with two shafts, in whieh balaneed skips went up and down. On the top of the bottom eaisson a easing of sheet 631. iron, from to J in. thiek, and weighing about 15 tons, was ereeted in sueeessive rings. The Amerieans have adopt, d I he pnenmatie system for some large works and introdueed improvements. At the St. Louis Bridge the foundations were earried to a greater depth than had been previously attained; and at the East River Bridge, New York, eompressed air was used in wooden eaissons of large dimensions. The seetion, Fig. 533, shews the interior of the eaisson in the St. Louis Bridge, with the main entranee shaft, the air-ehamber, and working parts of one of the pumps employed for exeavating the sand. A A are the air loeks, B B the air ehamber, C C the limber girdi rs, L) the diseharge or sand pump, ii O the side shafts, H the wrought-iron easing. IItimber braelng. The ehuinber is divided into three equal parts by timlier beams CC, running in a direetion at right angles to that of the iron girders above the roof. Inset pieees of plate iron are eonneeted to thi so beams at interval?, to stiffen and support the roof. The bottom of the eaisson projeets a eouple of feet below the timber beams and sills, so us to torm a eutting edge. The sand was foreed up by a...show more

Product details

  • Paperback
  • 189 x 246 x 13mm | 458g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236966260
  • 9781236966261