Scientific American Building Monthly Volume 25-26

Scientific American Building Monthly Volume 25-26

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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. 1898 edition. Excerpt: ...power. It would have to be counterbalanced like window-sashes, and the weights, cables, and machinery to operate would have to be practically invented. For such a curtain there was no precedent anywhere, and engineers were puzzled--especially as there were only six weeks in which to do the whole work. At last an engineer of Stoke-upon-Trent, Staffordshire, found out a inethocl--a costly one, to be sure, but one which had to be adopted, or there could be no show. Vithin the time appointed n. steel framework was set up as a. curtain-wall, 110 feet to the wall on either side of the proscenium-opening, and 90 feet to the roof. At each end of that opening are towers, to which there are bolted two other massive frames of iiveted steel, 1240 feet long by 45 feet high to roof, leaving the opening below 240 feet long by 45 feet high. Between these two upper frames the steel curtain rises in grooves on the towers, to be let down in less than two minutes lll case of danger. Over all the steel on either side and above is fastened a wire netting, and this is covered I1! asbestos plaster, having the outward appearance of 11 solid wall of stone and mortar. Some idea of the Bile Oi this curtain may be obtained from the fact that 110 bridge in the United Kingdom has an arch of equal span, nor was any such work ever so quickly acc0mpIished----50 far, at least, as is known to the engineering world. The cost was $75,000. The canvas scenery and backing--tl19largest ever known--are the first ever produced that can be regarded as strictly fireproof. It is treated Wllll B non-combustible compound of such a sort that any PM of it may be held in the fire without being burned. ll cannot burn. It simply turns black and chars. and 895 out. The backing of wood has...show more

Product details

  • Paperback | 84 pages
  • 189 x 246 x 4mm | 168g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236846613
  • 9781236846617