Marco Paul's Voyages and Travels Volume 6

Marco Paul's Voyages and Travels Volume 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. 1883 edition. Excerpt: ...saw several engine lathes. There were three or one room, for turning the gun-barrels. Marco watched the tool, as it moved, slowly along the barrel, with a small shaving of iron running out continually from its edge, as the barrel turned over constantly against it. There was a little stream of cold water, which fell all the time upon the point of the tool. It came from a little pipe, suspended over the work. The pipe was connected with a small flexible tube, about three feet long, which came down from a long metal pipe, which passed across the room overhead, and contained a constant supply of water. 'The water in this pipe was raised, as Forester supposed, by a pump from the mill-stream. The end of the little pipe over the work was attached to the machinery, so that it moved along with therest, and thus always delivered its little stream of water directly upon the edge of the tool, and upon the part of the iron which the tool was cutting. The flexible tube, or hose, as the workmen called it, allowed the pipe to be carried in this manner, along the barrel, from one end to the other, so as to pour the Water continually upon the point where it was needed. Marco wanted to know what the stream of water was for; and Forester told him that it was to keep the edge of the tool cool. The force of friction, produced by cutting so hard a material as iron, woull soon heat the tool, and take the temper out 0!. the steel--and then, the edge, being softened, would be immediately worn away. In fact, Marco observed, in many other instances, that such streams of water were made to fall upon the work, where the cutting tool was exposed to heavy friction, in order to keep it cool. ' The shavings cut off at each of the lathes where the barrels more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • United States
  • English
  • black & white illustrations
  • 123677969X
  • 9781236779694