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Geological Researches in China, Mongolia, and Japan; During the Years 1862 to 1865

Geological Researches in China, Mongolia, and Japan; During the Years 1862 to 1865


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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. 1866 Excerpt: ...in which the ore is smelted is a cavity in the ground, lined with charcoal powder kneaded with puddled clay, forming a hemispherical crucible (b) about 14 inches broad and 10 inches deep, with an underdrainage. In front is an earthen shield (c) to reflect the force of the blast, which enters through a clay nozzle (c/) from the boxbellows (e). The greater part of the smoke, etc., passes off through a large chimney (a). The crucible is lined with charcoal, and when fully dried about 80 lbs. of ore is added and covered with charcoal. When half melted 30 per cent. of pig-iron in lumps of about an inch cube is added. As soon as about one-half of the galena is freed from its sulphur, the whole is stirred. After about two hours the coals are withdrawn, the blast stopped, and water is thrown on the bath to cool the first layer of matto. This is repeated six or seven times till the surface of the lead is free, when it is cast in bars, the matte being thrown away. We have in this operation the simplest form of the precipitation process, the Niederschlag Arbeit of the Germans. The greatest production at these mines was in 1860, when, during three months, it averaged about 600 lbs. daily; at the time of my visit it was about 80 lbs. The running daily expenses of production for this small result of 80 lbs. were nearly as follows 2--The miners working in ore are paid according to the weight and quality of the ore extracted, receiving one cent for every 10 kans, or 80 lbs. of best rough ore, and one-half a cent for the same quantity of inferior. When not working in ore they are paid by the running foot on the gallery and the hardness of the rock, receiving per running shak,1 or foot, 60 cents for the hardest rock, and 14 for the softest, the average at these mines being 3...


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Product Details
  • ISBN-13: 9781235988660
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 88
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 123598866X
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 172 gr

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