Specification of John Wakefield : furnaces for boilers.

  • Wakefield, John
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Wakefield : furnaces for boilers. Source: Wellcome Collection.

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    Wakefield's Improvements in the Construction of Furnaces for Boilers, <§c. opening wider from each other at their further ends than in front (as shewn in the Drawing D), I now lay from three to six of the fire bars (according to the width of the fire grate) parallel to each other on each side respectively of the furnace, laying only the intermediate bars in the manner shewn in the Drawing D. The reason why these three, four, or more bars on each side 5 respectively are laid parellel to each other on the side to which they belong, is for the purpose of allowing the teeth of what I denominate the grate rake (which will be hereafter described) to move freely along between the bars at the side of the grate, i, i, i, doors, which open into the horizontal flues for the convenience of cleaning them ; k, k, the fire door; Z, 7, openings for the rods, 10 by which the slides or other contrivances are made to open or shut the apertures for admitting air into or excluding it from the air flue or flues, or into or from the blow’ers, to be hereafter described, m, m, m, m, m, m, m, blowers in the breast a, under the curb c, c, which pour in air from the cross air flue 1, 1, to supply oxygen for inflaming the smoke, which would otherwise escape uncon- 15 sumed into the flue. These may be of any convenient number, and wider or narrower in their apertures, or instead of many, one long aperture may be x x X X employed; m, m, m, m, side blowers for the same purpose; 1,1, the cross air flue supplied with air from the ash-pit. In the upper part of this flue are openings, (which I call the blowers m, m, m, m, m, m, m,) allowing air to 20 pass from the flue into the furnace, and which admit fresh air for igniting the smoke, as mentioned above. 2, 2, side air flues, also supplied with air X X from the ash-pit, and terminating at their upper ends in the blowers in m, m, for throwing in streams of air into the sides of the furnace to supply oxygen for the combustion of the smoke ; sometimes I have only one of these side flues 25 X X (m, m, Drawing D,) on each side of the furnace, some inches forw ard from the further end of the bars; but wflien the furnace is large, I introduce one more, (n, n,) on each side for the same purpose, still further fonvard; 3, the ash-pit. Having thus (for the purpose of rendering this Specification perfectly intelligible to any moderately skilled workman) given a general description of 30 a furnace in which the said improvements for which I received the said Letters Patent are introduced, I now proceed to enumerate more particularly in what the said improvements consist, namely, first, the blowers (m, m, m, m, m, m, Drawing B, and m, Drawing C); and here let it be observed, that these blowers produce a much greater effect from being directed against the fire 35 than if openings from the cross air flue (1, 1,) w’ere allowed to blow’ straight up against the bottom of the boiler; for, in the latter case, if the smoke has not acquired sufficient temperature to permit inflamation before it reaches the curb,
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