Statistics of Coal; The Geographical and Geological Distribution of Mineral Combustiles or Fossil Fuel

Statistics of Coal; The Geographical and Geological Distribution of Mineral Combustiles or Fossil Fuel

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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. 1848 edition. Excerpt: ... the llfain or Ten Yard Coal of Sta_fordshire.---The entire bed consists ofa series of thirteen seams of coal, each having separate names, of different or unequal thickness, amounting to feet, with the aggregate thickness of slate partings, I8 inches more; in all thirty feet from roof to floor. These are worked down by a series of six or more successive falls and undermining of the coal seams, after the manner shown in the subjoined diagram. Fig. 20. Section of the working if the Main or Ten Yard Coal, in the Dudley Cori!-Field. fll d p n lt is unnecessary to detail here the names and thickness of the several beds. The work commences by cutting out the lowest bed, called the Humphries, to tenor fourteen yards, the width of the stall, and two feet three inches high, which is the usual thickness required by the miners for Iioling, or undermining. The foundation of the coal being thus far removed, to a certain breadth, they then cross cut it at right angles, vertically, to loosen its adherence to the sides; cutting up as high as the third parting of slate. This, when separated, makes the first fall of coal, having a thickness of six feet three inches. The labourers who perform this part of the work, are locally called holcrs or pikemen. They undermine or cut out the coal with light picks, building up small supports, called "cogs" from the slatey spoil heaps, called gob. The vertical cutting is always carried up until it reaches a parting; but it does not appear that any exclusive selection of these partings is made. At these late partings the coal readily separates, and falls down when the supporting cogs are removed. The same process is adopted with regard to the second fall, and a succession of cogs and wooden props...show more

Product details

  • Paperback | 408 pages
  • 189 x 246 x 21mm | 726g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236588738
  • 9781236588739