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Hydraulic Mining; Reservoirs, Monitors, Elevators, Sluices, Classification, Test and Valuation of Alluvials-Water Power, &C

Hydraulic Mining; Reservoirs, Monitors, Elevators, Sluices, Classification, Test and Valuation of Alluvials-Water Power, &C


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About the Book

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. 1902 edition. Excerpt: ... absorption of water, together with the filling up of the chinks by sand and clay, soon stops all leakage. In all but the smallest and cheapest sluices, extra wooden side planks or thin sheets of iron are affixed to the box sides, so as to protect them from the wear caused by the attrition of the stones and gravel. When worn, these side streaks can be easily replaced. At the Last Chance Hydraulic Elevating Company, Bald Hill Flat, New Zealand, sluices, entirely of wrought-iron, were used and found superirrto those of wood. The boxes were 4 feet wide, and bolted together for convenience in erecting. Sluices are set on a certaii-inclination, grade, or slope, and this grade is usually expressed either as a fall of so many in-ches in the box length of 12 or 16 feet, or else as a percentage. In the former case, a 6 inch grade means that the box (12 feet long, if not otherwise stated) is set with a slope of 6 inches to every 12 feet, or, to state it otherwise, with a grade of 1 in 24. In the latter case, the same inclination might be described as a percentage, in this instance, as a 4% per cent. grade. The expressions are easily interchangeable by simple proportion. Example 1.--A sluice is set on a 6 inch (per 12 foot box) grade. Express this grade as a percentage: --' 144: ioo = 6: x (the percentage required). Thus a grade of 6 inches is equivalent to a 4% per cent grade. Example 2.---A sluice is set on a 4-1; per cent. grade. Express this grade as so many inches per 12 feet box. 100: 144 = 41!, -: x (the fall in inches per 12 feet). If the boxes are 16 feet instead of 12 feet long, the equivalent for a 12 feet box may be obtained by deducting one quarter from the inches of fall. Thus a grade of 8 inches per 16 feet box equals 8-2, or 6 inches...


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Product Details
  • ISBN-13: 9781230025421
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1230025421
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr


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