The Cosmopolitan Volume 8, Nos. 1-6

The Cosmopolitan Volume 8, Nos. 1-6

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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. 1890 edition. Excerpt: universally adopted, dates back to 1619, and possibly earlier, but was abandoned because of imperfect breech mechanisms. The most recent methods of constructing built-up guns also have their prototypes of centuries ago, resembling in principle the Armstrong, the Wahrendorff, and the Woodbridge guns. Though cast iron was employed as a gun metal about the middle of the fifteenth century, it was especially developed in this country about thirty years ago. An iron of high quality was produced, which, in combination with the Rodman method of casting cannon hollow and cooling from the interior, placed the United States in the front rank in the production of heavj-guns. The largest cast was the twenty-inch smooth-bore, which weighs one hundred and fifteen thousand one hundred pounds, fires a powder charge of two hundred pounds, and a projectile weighing one thousand and eighty pounds. As the strains at the bore and the exterior of the gun are related to each other by an established law of mechanics, inversely as the squares of the radii of these surfaces, it follows that in a thick tube or gun the exterior metal aids very little in resisting an internal stress. We must therefore adopt some sj-stem of putting the exterior under an initial strain or tension. This is done in a built-up gun by shrinking hoops on it, precisely as a tire is shrunk on a wagon wheel. In this case, the hoops themselves constitute the exterior, and the initial tension they are to undergo is accurately determined beforehand. With the cast-iron gun General Rodman accomplished the same thing, though not to the fullest extent, by keeping the exterior hot while the interior was cooled by a continuous flow of water through the bore. Gradually, the metal toward the more

Product details

  • Paperback | 396 pages
  • 189 x 246 x 21mm | 703g
  • United States
  • English
  • black & white illustrations
  • 1236849027
  • 9781236849021