Transactions of the Institute of British Architects of London Volume 1

Transactions of the Institute of British Architects of London Volume 1

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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. 1836 edition. Excerpt: ...the centre, an equipoise would be produced, and then no tie would be required; but it has been before stated, that the position of the supports was limited, and in such a way as to throw a vast preponderance into the central compartment, producing of course a proportionate degree of lateral pressure. To counteract this, an abutment is formed in the centre, by elongating the junction of the two half ribs, principally upwards, by which the pressure is spread over a greater extent of surface, tending towards the top; and this abutment is confined and secured at bottom by a wrought iron collar, put on when red hot, so that in cooling, the contraction tightens and completes the union. The application of this principle of a central abutment being considered novel, it gave rise to much discussion as to its efficiency; accordingly a series of experiments were made at Messrs. Bramah's, (who executed the work, ) upon models; the result of which was, that this form bore nearly double the weight of a strait bar of the same section. I was induced by the suggestion of practical men, to increase the substances of the rib beyond what was originally intended; but, from the result of all the tests and experiments, I feel assured that such increase might safely have been spared. Each pair of ribs forming one span weighed 33cwt. 3qrs. 3 lbs.; and the whole of the cast iron work, including columns, gutters, &c. weighed 32 tons and 32 lbs. Total expense, 706. 7s. 1 Id. Area covered was 3960 feet, equal to full 3. 6d. per foot, or nearly 18. per square. With respect to inverting the usual form in the upper compartment of the roof, viz.--from an external to an internal angle, it will be obvious that it affords the advantages of bringing the drainage of...
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Product details

  • Paperback | 64 pages
  • 189 x 246 x 3mm | 132g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236545036
  • 9781236545039