Congressional Edition Volume 2282

Congressional Edition Volume 2282

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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. 1885 edition. Excerpt: ...with the base of the breech. The transom is mortised into two steel side straps, which transmit the strain upon the breech to the trunnions upon the body of the gun. A second set of trunnions are placed ou the exterior faces of these side straps to support the gun upon its carriage. The centers of the truunious on the side straps are 23 inches in rear of the centers of those on the body. The tube, jacket, trunnion-ring, side straps, transom, and breech-screw are all made of Whitworth fluid-compressed steel. The quality of the material and the finish of these parts testify to the excellence of the work done by that celebrated manufacturer. The tube was finishturned, chambered, and rifled when received. The finish-turning of the exterior necessitated very delicate manipulation at this foundry in boring the casing in order to keep within the small limits required. It is preferable in manufacture to first bore out the casing and then turn the tube down to the limits prescribed. Hence tubes should not be finished on the exterior until they arrive at the place of assembly. A retaining ring of steel is screwed on the rear end of the tube. The exterior of this ring fits mechanically iuto the corresponding counterbore of the cast-irou casing. The breech-screw is set up and relieved by means of a tappet-lever attached to the rear. The mechanism is opened and closed for loading by means of a crank shaft passing transversely through the side straps, carrying two brass pinion-wheels which engage two corresponding racks screwed to the sphero-segmental surface forming the face of the breech. These racks are placed one on each side of the bore and extend downwards from points on a line with the center of the bore. 30(3 PRINCIPAL DIMENSIONS OF BORE....show more

Product details

  • Paperback | 174 pages
  • 189 x 246 x 9mm | 322g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123689779X
  • 9781236897794