Mining American Volume 52

Mining American Volume 52

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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. 1905 edition. Excerpt: ...Klerksdorp, 3; Lydenburg, 2. The total number of tons milled was 992,204, yielding 419,505 fine ounces of gold. This tonnage and yield hold the record for the year, being slightly in excess of the figures for May, which was previously the record month. The total number of stamps in operation was 7,053, with a duty of 5.01 tons per stamp per twenty-four hours. The month's yield was obtained from the following sources: Fine ounces. Mill 264,787 Concentrates 16,798 Sands 112,676 Slimes 22,305 Banks, etc 2,939 Total 419,505 A ROEBLING EXHIBIT. The exhibit of the John A. Roebling's Sons Company of Trenton, New Jersey, at the Portland Exposition possesses a high degree of interest, in that it suggests the really wonderful possibilities existing in the application of drawn wire. The cabinet in the cente.-of the exhibit contains samples of wire suitable for use for electrical purposes of all kinds, as well as peculiar shapes used in manufacturing. The most interesting of all of these samples is a spool containing wire one-thousandth of an inch in diameter. This wire, which resembles in appearance a thread of a spider's web, is made from a bar of steel four inches square. The ordinary processes of drawing through steel dies are followed during part of its manufacture, but before the wire reaches the required diameter it will cut into the hardest steel, and special dies in which holes are drilled through diamonds must be used. The cost of manufacture is so great that a bar of steel with a market value of $12 as it leaves the furnace would be worth $8,000 when drawn into this fine wire. In marked contrast with this delicate fiber are the wire An interesting side light is thrown upon the extent to which wire rope is used in the West by the fact that...show more

Product details

  • Paperback | 726 pages
  • 189 x 246 x 37mm | 1,275g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236901371
  • 9781236901378