Bulletin - American Railway Engineering Association Volume 134-140

Bulletin - American Railway Engineering Association Volume 134-140

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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. 1911 edition. Excerpt: ...below the cinder. The loam had been well forked, all lumps broken and all small stone eliminated. It was spread evenly in 4-in. layers, each layer being compacted by tamping with a tamper weighing about 20 lbs. The degree of compactness was tested by prodding with the unsharpened end of a lead pencil. When the last layer of loam was properly tamped, the high places were cut off to make the surface level to the desired elevation. The cinder was spread carefully upon the loam sub-grade in 4-in. layers, each layer being thoroughly tamped as above. The cross-ties were well rammed with cinder, so that the bottom of each tie was at the proper elevation with 24 in. of cinder under it. The car was started on May 19, and ran at intervals until June 24, when 19,210 round trips had been completed. Prior to June 1, water was sprinkled on the boxes in such quantity as to correspond to a total of one-inch rainfall, and thereafter on each day that the car ran, onehalf inch of water was thus applied, until on June 24 there had been a total of 4'A in. of water applied to each box. The settlement for the first part of the test was as follows: Box No. 1, 2J4 in.; box No. 2, 2% in., and box No. 3, 2V2 in. Second Part. On June 24, it was thought advisable to begin the second part of Test No. 5, by substituting certain depth of clean trap rock ballast instead of engine cinder. As in previous tests, the chief factor in determining the time for introducing stone ballast was the form of the settlement curves just previous to June 24, when the settlement was becoming less daily, as compared with the first few days of the test. The decrease in settlement just prior to June 24, indicated that the materials in the boxes had become well compacted, and in all...show more

Product details

  • Paperback | 150 pages
  • 189 x 246 x 8mm | 281g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236737458
  • 9781236737458