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.

    4/12 (page 2)
    Wakefield's Improvements in the Construction of Furnaces for Boilers, c^r. NOW KNOW YE, that in compliance with the said proviso, I, the said John Wakefield, do hereby declare that my said improvements in the construction of furnaces for boilers, and in the mode of feeding the same and burning the smoke, are particularly described and specified in manner following, reference being had to the Drawings hereunto annexed, and to the following general 5 description of a furnace in which my said improvements are introduced, and in which description the letters and figures of reference, when found in more than one of the said Drawings, indicate the same parts in all in which they are so found. * .... General description of a furnace in which my said improvements are 10 introduced:—a, a, a, the breast (often called the bridge) behind the fire, which operates to force up the flame and heated air into close contact with the bottom of the boiler while passing from the fire to the flue ; this is common to many furnaces for boilers that are constructed with any degree of skill. The said breast goes quite across from side to side, and is parellel with the 15 front of the furnace ; b, 6, b, b, 5, b, the cheeks placed behind the breast a, and which (like the said breast) tend to retard the flame and heated air, and to allow it more time to give off its heat to the boiler. Before the date of the said Letters Patent I was in the practice of introducing cheeks behind the breast at right angles to the sides of the bed (or bottom part of the flue), but 20 now I make the cheek next to the said breast to decline from the said breast as it, the said cheek, recedes from the side, and those cheeks which are further from the said breast to incline towards it, as shewn in the Drawing D. These cheeks extend from the sides to a little way beyond the central longitudinal line of the said bed. The said inclination given to the said cheeks makes 25 them perform their intended office better than when they are at right angles to the sides; and this is one of my said improvements for which I have obtained the said Letters Patent. The number of these cheeks is sometimes increased to four or five, or even six, when the boiler is of considerable length, c, c, the curb; this curb, which rests on the breast a* and projects from the $q said breast towards the fire, serves to impede the unconsumed smoke, which would otherwise pass off as quickly as possible towards the flue along with the hot air, which (having in its passage through the fire parted with its oxygen, is no longer able to maintain combustion), and so would escape without perform¬ ing its duty; but the smoke being thus impeded, and at the same time met by 35 a supply of fresh air poured in by the blowers m, m, m, m, m, m, m, (hereafter described), is at once urged back on the fire and furnished with oxygen to effect its combustion ; d> d, d, d, d, d, the curved sides of the furnace. These curved sides, as they rise from the bottom of the furnace, are made to incline