Lectures on Architecture (Volume 2) by Eugene-Emmanuel Viollet-Le-Duc

  • Author: Eugene-Emmanuel Viollet-Le-Duc
  • eBook title: Lectures on Architecture (Volume 2)
  • Category: Engineering & Transportation
  • Subcategory: Engineering
  • ISBN: 0486255212
  • ISBN13: 978-0486255217
  • Size PDF: 1909 kb
  • Size eBPUB: 1579 kb
  • Other Formats: azf odf lit pdf ibooks mobi cb7
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Lectures on Architecture (Volume 2)
This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1881. Not illustrated. Excerpt: ... These panels, prepared in advance, even in winter, and sufficiently dried, may be raised into place like voussoirs and set with plaster of Paris or cement. Each zone as it is set, forms a concentric ring which cannot give way, and the next may be immediately superposed. It need not be added that the panels may be moulded into sunk compartments, so as to form an interior decoration. The centering for a dome thus covered in by means of moulded panels will not need planking, as each panel presents a solid surface. All that is needed therefore is thirty centres or sixty half-centres under the ascending joints. For the fixing of these centres iron is very advantageous, since as that material retains its value it may be afterwards employed for other pur Fio. 15. -Method of centering for Vaulted Dome. poses, or be exchanged when the work is completed. If therefore, fig. 15, we fix up a circle of T-iron or even cast-iron at A, and another circle of angle-iron at B; if as an extra precaution we tie this lower circle with fifteen tie-rods c, bolted to a ring D; then between the flanges of the upper circle and the flange of the lower circle it will suffice to fix sixty timber blades E, with wood curves and clips, which will stiffen them and serve for setting the panels; the ascending joints of the latter being over each of the centres. If instead of the lower circle we put a polygon of sixty sides of plate-iron, jointed at every second angle with rivet plates, as shown in detail G, we may dispense with the tierods. Each panel will average only one and a half cubic feet, and will therefore weigh only, if in pressed concrete, about two cwt., or in dried plaster of Paris about one and a half cwt. Their number being 420, the total weight of the dome, 65 feet wide at the base a...

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