Technical Paper Volume 121-140

Technical Paper Volume 121-140

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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. 1916 edition. Excerpt: ...18, 24, and 30), so as to roll the coal back and forth, and then formed into a conical pile by gathering together the four corners of the cloth (figs. 19, 25, and 31). The quartering of the conical pile must be done as follows: The cone is flattened by pressing its apex vertically down with a shovel or board, so that when the pile is quartered each quarter will contain the material originally in it. The flattened mass, which must be of uniform thickness and diameter, is then marked into quarters (figs. 14, 20, 2(J. and 32) by two lines that intersect at right angles directly under a point corresponding to the apex of the original cone. The diagonally opposite quarters (B, B in figs. 16,22,28. and 34) must then be shoveled away and discarded and the space that they occupied brushed clean. The coal remaining must be successively crushed, mixed, coned, and quartered until two opposite quarters shall equal approximate' 10 pounds of A-inch, or 4-mesh. size. This 10-pound quantity must be thoroughly mixed and divided into two equal parts and each part placed in a container suitable for transportation. Mark one of these samples "original" and the other "duplicate " and forward the " original " to the laboratory, retaining the "duplicate" for forwarding in case the "original" should be lost or damaged in transit. If it is not convenient for the sampler to retain the "duplicate" sample, as when he is traveling from place to place, then the "duplicate" sample also should be forwarded to the laboratory. In case a crusher that will break the coal to-inch or 4-mesh size and a riffle are available for mechanically crushing and reducing the sample they should be used instead of more

Product details

  • Paperback | 208 pages
  • 189 x 246 x 11mm | 381g
  • United States
  • English
  • black & white illustrations
  • 1236804627
  • 9781236804624