Fifty Years' History of the Development of Green's Economiser; With Notes on Other Economiser Inventions and Early Tubular Boilers

Fifty Years' History of the Development of Green's Economiser; With Notes on Other Economiser Inventions and Early Tubular Boilers

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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. 1895 edition. Excerpt: ...construction of the arrangement that a disastrous explosion resulted. This called wide attention to the dangerous character of this type of apparatus, unless equipped with a number of safety valves, and led to its being generally discarded; Needham 1n tne same year, 1868, a Patent No. 3,358 Patent No. 3,358, was granted to Mr. Richard Needham, for 1868 improvements in Economiser scrapers. The novelty claimed in this case was the fixing of the movable blades of the scraper, which were of flat semi-circular shape, in guides, so that the scrapers were inclined to the axis of the tubes at an angle of about 45. The previous use of blades of the form described is admitted in the Patent Specification, and the only claim for novelty appears to have been the fixing of them at an inclination in the manner stated. Needham A fevv months later, Mr. Richard Needham, in Patent No. 3,749, 1 Patent No. 3,749, 1868, described further J868 designs for improving the operation of scraper driving and reversing apparatus. One method by which he proposed to operate the gear for working the scrapers is shown in Fig. 35. This consisted/ in placing within the Economiser tube an archimedean screw, having a central shaft revolving in a footstep at the bottom, and passing through a stuffing box at the top. The idea was, that the current of water travelling up the tube would act upon the screw and cause it to revolve, and that from the motion thus imparted to the shaft, the scrapers could be operated. The current of water flowing through an Economiser is so slow, however, that it is questionable whether any appreciable motion could be obtained in this way, and it is doubtful if the design was ever more than sketched on paper. A more ingenious and practical proposal, ..show more

Product details

  • Paperback | 24 pages
  • 189 x 246 x 1mm | 64g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236865383
  • 9781236865380