The Locomotive of the Hartford Steam Boiler Inspection and Insurance Co Volume 12

The Locomotive of the Hartford Steam Boiler Inspection and Insurance Co Volume 12

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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. 1891 edition. Excerpt: ... flow from the furnace directly through the opening, mingling but little with one another as they rise from the incandescent fuel, and passing directly to the fire surfaces of the boiler. Where two or more openings are used, the temperature has been found by experiment to be more or less unequal under the boiler, back of the bridge wall. In order to overcome such difiiculties as have been noticed, the furnace here illustrated was designed. Fig. 1 is a view from the front looking into the furnace. Fin'. 2 is a longitudinal section through the furnace, and Fig. 3 is a top view or plan of it. The opening in the rear wall of the furnace, it will be noticed, is contracted both horizontally and vertically, at about the middle, flaring towards the furnace and also toward the exit. This construction is seen clearly in the illustrations. The general shape of the opening corresponds to what is known in physics and mechanics as the vena contracta. The gases escaping from the furnace flow without interruption into the flared opening, and if there are currents of different temperature, owing to the admission of an excess of cold air through the feeding doors of the furnace, or otherwise, they are brought together at the contraction, and are brought to as nearly uniform:1 temperatureias possible. After emerging from the venacontracta (which in this construction is in the bridge wall itself) the gases are uniformly distributed to the heating surfaces of the boiler, and not concentrated on any particular point, as is the casc with some other constructions. In Figs. 2 and 3 it will be noticed that the grate bars do not extend entirely back to the bridge wall, but only as far as a flat ledge or hearth of fire brick, about a foot wide. In feeding the...show more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236826574
  • 9781236826572