The New International Encyclopaedia Volume 3

The New International Encyclopaedia Volume 3

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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. 1903 edition. Excerpt: ...that railway across the Menai Strait. It was required by the British Admiralty that these bridges--called the Britannia and the Conway--should be constructed so as not to interfere with navigation, with clear spans of upward of 400 feet. The longest arcli spans that had previously been constructed did not exceed 240 feet, and suspension bridges, as built at that date, not being suitable for heavy and rapid railway traffic, the engineers were obliged to devise some new form which should conform to the stipulated conditions. Mr. Stephenson, having decided on the tubular form, proceeded, in conjunction with Mr. Fairbairn, to make an elaborate series of experiments on tubes, to determine the most suitable arrangement of the wrought iron of which they were composed. They found that a rectangular tube, of which the top and bottom were cellular, gave the greatest strength with the least material. The span of the Conway tube was 400 feet, while the tubular part of the Britannia Bridge consisted of two spans of 460 feet and two of 230 feet each in the clear. The foundation stones of these bridges were laid in 1846 and 1847, respectively. In 1854 work was begun on the most important tubular bridge ever built--the Victoria Bridge over the Saint Lawrence River, near Montreal, Canada. The total length of this bridge is 9144 feet, or nearly 1% miles, and it was built in 24 spans of from 242 to 247 feet each, and one of 330 feet. About 9000 tons of iron were used in the tubes. In 1898-99 this bridge was replaced by a pin-connected truss bridge having 24 spans of 254 feet and one span of 348 feet, and requiring 20,000 tons of steel in its construction. The Victoria Bridge was the last important tubular girder bridge to be built. By the date of its completion, in...
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Product details

  • Paperback | 888 pages
  • 189 x 246 x 45mm | 1,551g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236528433
  • 9781236528438