Minutes of Proceedings of the Institution of Civil Engineers Volume 60, PT. 2
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. 1880 edition. Excerpt: ...used for footpaths, or where there are great changes of temperature. The Paris engineers, after repeated trials on account of its cheapness, have proscribed its use. This mixture is readily recognised by its dull, black appearance, its characteristic smell, and the hard metallic sound it gives when struck against iron in cold weather. The unpopularity of asphalt with many engineers and architects arises from their having had work done with preparations of gas-tar improperly called asphalt. Some contractors substitute shale grease or pitch from suets, or Stockholm tar, for bitumen. The result is a soft surface for the first year, which gives off oils by evaporation, and breaks up after two or three years' wear; whereas asphalt properly laid on a good foundation will wear down evenly until little more than a film remains. The tricks of the small Paris contractors are many. They keep a little natural asphalt and bitumen beside their boilers for show, all the while using gas-tar and chalk, so that when the work breaks up the superintendent is frequently ready to affirm that asphalt was used, and declares for ever after that asphalt is of no use. In conclusion, the Author desires to express his acknowledgments to M. Alphand, Director of Public Works of Paris, M. Vaissiere, Chief Engineer, M. Allard, Chief Engineer., M. Barabant, Engineer, M. Vauthier, Municipal Councillor, Paris, Messrs. Durand-Claye and Herve Mangon. of the Erole des Ponts et Chaussees, M. Mascart of the Bureau Central Meteorologique, and to M. Dumas and M. Deval, Conductors of the Ponts et Chaussees. The Paper is accompanied by a series of diagrams, from which the woodcuts have been engraved, by several specifications, and by a schedule of prices relating to the maintenance...
- Paperback | 212 pages
- 189 x 246 x 11mm | 386g
- 13 Sep 2013
- Illustrations, black and white