American Edition of the British Encyclopedia; Or, Dictionary of Arts and Sciences; Comprising an Accurate and Popular View of the Present Improved State of Human Knowledge Volume 10

American Edition of the British Encyclopedia; Or, Dictionary of Arts and Sciences; Comprising an Accurate and Popular View of the Present Improved State of Human Knowledge Volume 10

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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. 1821 edition. Excerpt: ...to the lower bed by a moveable key-bolt; at the upper end it turns on a bolt as a centre, so as to rise up, as shown in fig. 1: I is a rope going round a pulley, one end fastened to the beam, the other to a weight which counterbalances the beam. The operation of the machine is begun by screwing the swinging bed of the press up as high as it will go, and turning up the bar, k: a bag, filled with hops, and sewed up, as before described, is then placed on the lower bed, K, and the bar, k, brought down and keyed fast, to keep the bag under the press; the man upon the stage, H, then turns the winch, / and by the action of the pinion fixed upon its spindle, turns the wheel, E, and thus brings the screw and the swinging bed of the press down upon the bag, and compresses ii into a very small space. A small cord is now passed through the spaces between the pieces of wood, forming the lower side of the swinging bed, and the upper side of the fixed bed, aml reefed twice round the bag, and tied fast: the man at the handles now turns it back, and draws up the swinging bed to relieve the bag, the cord retaining it in its compressed state. In 1798, the Society for the Encouragement of Arts, Manufactures, and Commerce, rewarded Mr. John Peak, of the New Road, near the Adam and Eve, London, with thirty guineas, for an improved packing press, shown in fig. 3, Plate Press, which is a front elevation of the machine, A A, the frame of the press; B 13, the large screws, which, in this press, contrary to those in common use, are fixed and immoveable; C, a circular iron bar, extending beyond the sides of the press, and having thereon two worms or endless screws, E, E, which work in two toothed wheels, fixed to the nuts; by turning the winch, D, the nuts and bed..show more

Product details

  • Paperback | 230 pages
  • 189 x 246 x 12mm | 417g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236958845
  • 9781236958846