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Home > Art, Film & Photography > Bulletin of the American Institute of Mining Engineers Volume 133-137
Bulletin of the American Institute of Mining Engineers Volume 133-137

Bulletin of the American Institute of Mining Engineers Volume 133-137


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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. 1918 Excerpt: ...of those on land 2 is parallel to the rifling. This suggests two different determinants of the direction of these cracks, the transverse contraction of the land for those parallel to the rifling, and scoring by the gases for those parallel to the axis. 46. Relative Erosion of Land and Groove.--The thickness of the metal in land and groove in my two rings is as follows: Thickness at Land Thickness at Groove Forward ring 0.4998 in. 0.4666 in. Rear ring 0.4348 in. 0.4311 in. Difference 0.0650 in. 0.0355 in. Each result here given is the average of four, each of which represents one of four grooves or lands taken at about 90 apart. Each of the original measurements was the maximum thickness of the land or groove examined. One can draw no close inference as to the relative erosion on land and groove from the photographs of Prof. Fay's rings, (Bulletin No. 120 (December, 1916), 2239 and U. S. Army Ordnance Department Report on Tests of Metals (1913), Photo 2 after p. 134). From this we infer that the erosion is about 85 per cent, more rapid on the top of the land than at the bottom of the groove, but yet there is evidently an important degree of erosion even at the bottom of the groove. These inferences are somewhat weakened by our not knowing that the initial dimensions of these two rings were identical. 47. Relative Erosive Action of Driving Band and Gases.--Erosion is generally referred chiefly to the gases and only in minor degree to the scraping action of the driving band. This is reasonable in view of the facts, first that the metal at any given transverse section is exposed incomparably longer to the rush of the gases than to the driving band, and second that the steel is incomparably hotter during most of its exposure to the gases than during its contact ...


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Product Details
  • ISBN-13: 9781130117509
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 768
  • Spine Width: 39 mm
  • Width: 189 mm
  • ISBN-10: 1130117502
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 1347 gr


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