Specification of Alexander McDougall : steam engine and other furnaces, &c.

  • McDougall, Alexander.
Date:
1855
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Alexander McDougall : steam engine and other furnaces, &c. Source: Wellcome Collection.

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    31^DougalVs Method of Consuming Smoke in Steam Engine Furnaces, ^c. and consequent reduction of fuel employed. By the time that the fuel in the furnace a has attained a white heat, and perfect combustion is maintained,' the fuel in the furnace h will have burnt down and exhausted itself, consequently requiring “firing up” or replenishing with fuel. The dampers c? and e must now, be respectively elevated and depressed, thus opening the flue c of the furnace a 5 and closing the flue / of the furnace h. The current of the draught will now be reversed, and the superabundant smoke from the “ green fire” in the furnace h will be carried in the direction of the arrows over the now “ live fire ” in the furnace a, where a perfect consuming of the smoke will take place, and the caloric continue its course through the flue c to the main flue thus it will be 10 seen that by alternately closing and opening the fljnes c and / at the time of “ firing up,” an effective combustion of the smoke4volved from either furnace is attained. The dampers e and d are formed of a case or box of cast iron, open at one side and filled with fire brick, so that the face of' the fire brick may always be presented to the flue. The dampers are actuated by the handle h 15 in front of the boiler, the cross beam/ arcs k, k, and chains I, I, secured to the top of the iron case of the damper (see Figs. 1 and 3). For the purpose of keeping the fire doors cool, I propose to make the “ dead plate ” hollow, and to feed the boiler with water through the “ dead plate.” Having now particularly described the nature of this Invention, and the 20 manner in which the same may be performed, I wish it to be distinctly under¬ stood that I claim the novel and particular arrangement of flues and dampers to furnaces or fire-places where two or more are used in conjunction with each other, so that the draught may be reversed at will, in such a manner that the superabundant smoke of one furnace or fire-place may be made to pass over 25 and in contact with the bright fire of the other for the purpose of ensuring its effectual consumption, as herein particularly described and set forth, and fully illustrated in the accompanying Drawing. In witness whereof, I, the said Alexander M^Dougall, have hereunto set my hand and seal, this Twenty^eighth day of September, in the year 30 of our Lord One thousand eight hundred and fifty-five. A. McdOUGALL. (l.s.) LONDON; Printed by George Edward Eyre and William Spottiswoode, Printers to the Queen's most Excellent Majesty. 1855.