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Mining and Metallurgy Volume 124

Mining and Metallurgy Volume 124


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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. 1917 Excerpt: ...exceedingly microscopic skin. I think that in the case of the copper wire, the working has gone pretty well through the wire itself and it is an integral cause of the failure of the wire to take this 60 or 100 twists as it should. 1 Bulletin No. 123 (March, 1917), 416. H. C. Wilson, Springfield, Mass.--This valuable paper deals specifically with the erosion of great guns, presenting problems quite different, in many respects, from those involved in small arms, with which I am immediately concerned. However, there are some questions of common interest which I would like to ask Prof. Fay. Prof. Fay first says that after continued firing the surface of the bore becomes hard and brittle, cracks and wears away. Mechanically, to what extent may this deterioration be accelerated by the "whip" or intensive vibrations of the unsupported breech end of the gun, when we consider that a 12-in. 50-caliber gun is unsupported for 36 ft. beyond the trunnion mount to the muzzle, with an actual deflection of 0.2 in. below the bore-axis, equal to 4 or 5 min. muzzle angular deflection? Could the pounding or hammering of the traveling projectile be considered as "working" or forging the surface-metal of the bore? This axial vibration is sometimes so severe as to "ring" off the muzzles of our great guns. Would it be advisable to redesign the gun-chassis to better support this present outboard mass or otherwise dampen or flatten out these wave vibrations? General Rohne has noted that the very fine skin veins of the fractured bore-surface appeared as ridges when magnified, and concluded that the metal had reached the melting point and had extruded under the high internal stresses. It is interesting and valuable that Dr. Fay notes the impropriety of try...


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Product Details
  • ISBN-13: 9781130606577
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 164
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 1130606570
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 304 gr


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