Harper's Round Table Volume 14

Harper's Round Table Volume 14

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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. 1893 edition. Excerpt: ...the adoption of one which, it was believed, possessed all the properties required in a far higher degree than any cable that had yet been laid. Its flexibility was such as to make it as manageable as a small line, and its strength such that it would bear, in water, over six miles of its own weight suspended vertically. The conducting medium consisted not of one single straight copper wire, but of seven wires of copper of the best quality, twisted around each other spirally, and capable of undergoing great tension without injury. This conductor was then enveloped in three separate coverings of gutta-percha of the best quality, forming the core of the cable round which tarred hemp was wrapped, and over this the outside covering, consisting of eighteen strands of the best quality of iron wire, each strand composed of seven distinct wires twisted spirally in the most approved manner by machinery specially adapted to the purpose. Such was the exquisitely constructed cable used on this occasion. Great attention was also paid to the arrangement of the apparatus for paying out the cable. The machine for this purpose was placed on the deck of the Great Eastern. the largest ship ever built. Its position was in the afterpart of the vessel, and somewhat on the starboard side, to be clear of the masts, and so forth. The cable as it came up from its enormous coils in the hold passed, first, through a guiding groove and over a deeply grooved wheel on to the drums, each of the latter being furnished with four deep grooves, each groove being cut one-eighth of an inch deeper than the former to allow for slack. The cable, after winding round these drums, passed on from the last groove over another guiding wheel to a distinct piece of machinery, also...show more

Product details

  • Paperback | 876 pages
  • 189 x 246 x 44mm | 1,533g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236753291
  • 9781236753298