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I.C.S. Reference Library Volume 25; A Series of Textbooks

I.C.S. Reference Library Volume 25; A Series of Textbooks


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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. 1905 Excerpt: ... two for hoisting. If there is a reasonable probability of a large output, it is best to sink the three-compartment shaft at once. The size of the hoisting compartment is determined by the size of the cage or skip to be used. 43. Number of Shafts.--If it is desired to remove the deposit quickly, several shafts will be required, each shaft having its own hoisting equipment. 44. It is common practice, where several shafts are sunk, to remove the ore quickly, to have no ladderway in the hoisting shafts, thus reducing the danger of fire (the ladder compartments always being the hardest in which to fight fire), special ladderway and pumpway shafts being provided for the mine. 45. Arrangement of Compartments.--If several rectangular compartments are used, it is best to place them Fig. B. Fig. 6. side by side rather than in a compact block, as the former arrangement gives the greatest resistance to crushing. (See Figs. 5 and 6.) 46. Form of Shaft.--When shafts are to be timbered, they are usually rectangular. When the lining is composed of brick, stone, or iron, the form is usually round or elliptical, as this gives greater strength with these materials than would be afforded by the square or rectangular form. The objection to the curved outline is that all the area is not available for hoisting. 47. Shaft Templet.--Before commencing to sink, the shaft site should be graded off level by cutting away all Fig.?. inequalities of surface, and long sills should be laid on each side of the proposed opening. Cross-pieces are framed into these sills, making a rectangular frame (Fig. 7), which constitutes a templet of the shaft, and serves as a foundation for whatever timbering is required at the collar. Its inner surface is flush with the inner face of the shaft curbing. ...


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Product Details
  • ISBN-13: 9781236318718
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 154
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1236318714
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 286 gr


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