The Encyclopaedia Britannica, or Dictionary of Arts, Sciences, and General Literature; Bur - CLIM Volume 6

The Encyclopaedia Britannica, or Dictionary of Arts, Sciences, and General Literature; Bur - CLIM Volume 6

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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. 1854 edition. Excerpt: ...from allowing any connection with the middle points of the main braces. This construction also may be followed till each beam AC and CB is loaded to ten times what it can safely bear without the secondary trussing. There is another way by which a bridge of one beam Another may be supported beyond the power of the first and sim-method, plest construction. This is represented in fig. 14 and fig. 15. The truss-beam FG should occupy one third of AB. The advantage of this construction is very considerable. The great elevation of the braces, which is a principal element of the strength, is preserved, and the braces are greatly shortened. This method may be pushed still farther, as in fig. 16. And all these methods may be combined, by joining These methe constructions of fig. 14 and fig. 15 with that of fig. 16.thods cornIn all of them there is much room for the display ofhined. skill in the proper adjustment of the scantling of the timber, and the obliquity of the braces to the lengths of the different bearings. A very oblique strut, or a slender one, will suffice for a small load, and may often give an opportunity to increase the general strength; while the great timbers and upright supports are reserved for the main pressures. Nothing will improve the composition so much as reflecting progressively, and in the order of these examples, on the whole. This alone can preserve the great principle in its simplicity and full energy. These constructions are the elements of all that can be The eledone in the art of building wooden bridges, and are to be ments of found more or less obviously and distinctly in all attempts a1't, lal ean of this kind. We may assert, that the more obviously M they appear, the more perfect the bridge will be. It more

Product details

  • Paperback | 984 pages
  • 189 x 246 x 49mm | 1,719g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236601122
  • 9781236601124