Water and Sewage Works Volume 6

Water and Sewage Works Volume 6

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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. 1894 edition. Excerpt: ...pounds for a sectional area of one square inch is ascertained. Any other degree of strength could be used for this purpose, but preference is given to the one named on account of convenience in testing, ascertained by experience. The writer has invented and uses an instrument called a tractor, with which test pieces of asphaltic cement, etc., are with the utmost facility prepared so as to have uniform density and dimension; and the tests of strength are made with a specially devised apparatus which registers in each case the breaking strain of the sample. The results secured harmonize well and give satisfactory evidence of the sufficient accuracy of the results obtained. The following data are transcribed from the writer's laboratory records to illustrate the results secured in tests of this character: A strength of one hundred pounds per square inch of area is, for the material named, found at the respective temperature as follows: Crude cheese pitch, 214 F.; refined cheese pitch, 203 F.; cement from pitch, 118 F., which reads that the refined asphalt was 11 more fluid than the crude; and that the cement was 85 more fluid than the refined. There are co-efficients of changes in the fluidity, depending respectively upon the temperature, inorganic admixtures in it, 'and upon the percentage of certain component groups of its hydro-carbon elements, concerning which publication will be made in due time. It is found in these tests that the fractures of test pieces differ greatly, under varying conditions, and present appearances which lead to their classifica Dolttoitrey. tion as viscous, earthy, vitreous and crystalline Biographical sketch in or dendritic, and concerning which something is April Number, 189., ., . rt i i rn page 195. to be said...show more

Product details

  • Paperback | 146 pages
  • 189 x 246 x 8mm | 272g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236898621
  • 9781236898623