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The Mining Engineer Volume 43

The Mining Engineer Volume 43


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ... method adopted was extremely simple. Typical piecesof coal of a convenient size were fixed, by means of putty or somesimilar material, in a metal holder, and blocks cut out of them by a fret-saw. At first specimens of about a cubic inch in volume were cut, but these proving to be a little too thick', rods about inch square and 1 or 2 inches long were used, the saw not permitting of the cutting of longer pieces. A photographic plate was. placed in a paper bag, the samples laid on top of the paper witb the bedding at right-angles to the plate, and the whole exposed to the rays for about 30 seconds. After the plates had been developed and examined, the blocks themselves were broken up for examination, and finally powdered for analysis. The radiographs are of the same size as the pieces of coal used, but, of course, show objects reversed, the coal appearing light and the ash dark. Whether the amount of ash left by a coal can be reduced by washing or blowing must depend in part on the distribution of the ash. "Where this is in distinct veins or patches, a moderate amount of crushing will serve to liberate it from the coal substance, and permit it to be washed away; but if the ash is in a fine state of division, and is diffused through the whole mass of coal, it is clear that it cannot be removed unless the whole of the coal be reduced to a very fine powder, when it would have little, if any, commercial value. Figs. 5 and 6 (Plate IX.) illustrate coals of the two types, Fig. 5 representing a Durham gas-coal, containing veins of calcite, and leaving 3T6 per cent, of ash, which is concentrated and could easily be removed; while Fig. 6 is a Welsh anthracite, yielding 310 per cent, of ash, which, however, is diffused through the whole mass of the coal, and it ...


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Product Details
  • ISBN-13: 9781130036633
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 292
  • Spine Width: 15 mm
  • Width: 189 mm
  • ISBN-10: 1130036634
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 526 gr


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