The Repertory of Arts and Manufactures Volume 9

The Repertory of Arts and Manufactures Volume 9

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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. 1798 edition. Excerpt: ...an angle, suppose thirty degrees, they may form a roof or cover, from which the rain, as it descends, may run ofi', and also the solutions, as they are taken up upon them. On' the south or lower fide, the boards may be strengthened, and secured to each other, by battens run-' ning across them. On the tops of the pillars are to be fixed, by Ptout hinges, with the pins of the hinges on the north fide of the pillars, and firaps going round the tops of the pillars, two bars or pieces of wood, so as to confiitute levers or balances; when these are suspended horizontally, a cord or chain must drop from their south ends vertically, and be secured to the frame-supporters; These bars or pieces of wood, which I will call evaporating-le-vers, must be made tapering; so that, when they are suspended in an horizontal direc-' tion, the south end of the lever may be the smaller and lighter, and the north end the larger and heavier. If the evaporating reservoirs be about fifteen feet wide, I would have the south end of the evaporating levers from about twelve to fifteen feet long, and the north end about seventeen to eighteen feet long; where they must be joined by other pieces of wood, of such weight that, with the aid of the ftrength of a man, they I may izinuninn, . may eafily Counterpoise the evaporating frames loaded with the solutions, and move them. i The south fides of these evaporating frames are to have reeds, branching twigs of trees, or other light materials, fastened to them, but not to projecft so far as to prevent their' dipping properly into the solutions: these will not produce an increase of surface by their number, but occafion a dripping after being immerged. When the solutions are very much concentrated, they may be removed, or else they must..show more

Product details

  • Paperback | 70 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123652845X
  • 9781236528452