Report of Commission Appointed to Investigate the Waste of Coal Mining, with the View to the Utilizing of the Waste

Report of Commission Appointed to Investigate the Waste of Coal Mining, with the View to the Utilizing of the Waste

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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. 1893 edition. Excerpt: ...cross-sections were next considered, and the probable average thickness of the coal on each section, were it all contained in one horizontal bed, having the length of the surface underlaid by the lowest workable bed (as shown on section), was determined; the details of how these average thicknesses were obtained is best described with the first cross-section considered. See page 62. (e.) The contents of the areas is now obtained by multiplying the mean of the average thickness of coal on the bounding sections by the number of acres in the area, by the number of tons in one acre of coal one foot thick, described in detail table A, page 75. Second.--In the Eastern Middle field, which comprises a number of small unconnected basins, it seemed best to calculate the area and estimate the contents of each bed separately; this was made easy here by the publication on the mine sheets of the outcrops of nearly all the workable beds. This method was also used in the areas between the several ends of fields and the nearest cross section. Third.--The estimate of the contents of the Panther Creek basin, Southern coal-field mine sheets I., II., and III., is copied from the estimate made under the direction of the late Charles A. Ashburner, by a method devised by him and described in full in Report AA, chapter V. The surface and bed areas for Western Middle sheets I., II., III., and IV., were also computed under Mr. Ashburner's direction. Professor Lesley has kindly allowed me to make use of these computations for this estimate. Specific Gravity. The number of tons in an acre of coal one foot thick is determined by the weight of a cubic foot of coal; this varies in different benches of the same bed, in different parts of a field, and in different fields. To...show more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236527356
  • 9781236527356