Three Reports on the Use of the Steam Coals of the 'Hartley District' of Northumberland in Marine Boilers, by W.G. Armstrong, J.A. Longridge, T. Richardson. with an Appendix

Three Reports on the Use of the Steam Coals of the 'Hartley District' of Northumberland in Marine Boilers, by W.G. Armstrong, J.A. Longridge, T. Richardson. with an Appendix

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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. 1858 edition. Excerpt: ...hydrogen would be those to which, in the boiler experiments, most air, or, in other words, the "largest opening of the damper," had been accorded; but in this respect either no attention has been paid, or an opposite system pursued, because we find that whilst the area of the damper draught has not unfrequeutly been 112, 126, 132, or even 168, with varieties of Welsh coal, the highly hydrogenated Hartley coals have been pretty uniformly limited to 56, 84, and 112 as a maximum. The effect of this regulation has been to cause a prodigious difference in the results from each of these coals--differences which are, in fact, greater upon one and the same coal than can possibly exist between very different descriptions of coals; and yet these discordant and artificially created variations are summed up into an uveruge, which is put down as the true heating power of the coal in question. Similarly other cases have been treated, in which moro air has been admitted than was necessary for combustion, and, therefore, the heat bus been carried oil' into the chimney; and here again an average is struck upon a principle not lew grossly incorrect than it would be to measure the height of a man's body when he lay on his back, then again when he stood upright on his feet, and take the mean of the two as his real altitude. I have arranged these two classes of cases under the respective heads, "Damper too little open," and "Damper too much open," but will only quote a few of the instances of each, and mention the names of others; and I wish particularly to direct attention to the gradual increase in the effect of the coal as the maladjustment of the damper has been remedied. CASE FIRST.--DAMPER TOO LITTlE OPEN. Ebbw Vale Coal gave with...show more

Product details

  • Paperback | 38 pages
  • 189 x 246 x 2mm | 86g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236559789
  • 9781236559784