The Mineral Resources of Oregon Volume 1, No. 7

The Mineral Resources of Oregon Volume 1, No. 7

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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. 1914 edition. Excerpt: ...in the field cannot be and are not thus taken account of by the users and makers of tile. The purpose of the test should be to ascertain the strength quality of the tile, as compared with other tile, or with standards known to be safe strengths under ordinary circumstances. The test should be applicable to his product by the tile manufacturer, who may or may not know where his tile are to be used. The actual value of trying to imitate service conditions, therefore, or of using the fact that such an attempt is made as a recommendation for a particular method of testing may be open to question. After safe limits of strength, as determined by the test, have been established, it should not be a matter of much concern whether the type of equipment employed applies pressure in one way or another so long as it gives uniform and dependable results. While the sand bearings test thus possibly comes nearest to reproducing ditch conditions, it is the least simple to make, requiring not only the procuring and handling of the sand itself, but also lumber for the sand-boxes. Moreover, the care and adjustment necessary to adapt the bearings to successive tile, and especially to successive sizes of tile, are a factor in its use wherein whatever distinct advantages it may possess, may be in part lost through the untrained and sometimes unintentionally careless manipulation of the ordinary maker or user of drain tile. By actual timing, from one to seven minutes longer time is required to make the sand bearing test than with either of the other machines. The conspicuous and undisputed advantages claimed for the sand bearings test, aside from the questionable one already discussed that it gives nearest to the real supporting strength of the tile, are: the use...show more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236798309
  • 9781236798305