Specification of Joseph Gregson : construction of chimneys, &c.

  • Gregson, Joseph.
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Joseph Gregson : construction of chimneys, &c. Source: Wellcome Collection.

    4/10 (page 2)
    Gregsoris New Method of Constructing Chimneys, <§c. NOW KNOW YE, that in compliance with the said proviso, I, the said Joseph Gregson, do hereby declare that the nature of my said Invention, and the manner in which the same is to be performed, is described and ascertained in the following explanation thereof with reference to the Drawings hereunto annexed5 By the common and ordinary mode of constructing chimneys the smoke ascends immediately from the fire into the chimney. Now instead of that direct communication, I do, with bricks and mortar, iron, or other materials used for chimneys, before the grate is introduced into the fire-place), begin the basement of the chimney from the hearth, from whence I continue it in a perpendicular 10 direction, if practicable, to the top of the building, as at A, Figure 1, in the plan hereunto annexed, but in that side of the chimney next to which the grate will stand I leave a space or cavity proportioned to the size of the fire, or equal to the width of the grate, and about four inches deep, marked B in the said plan, and of the same distance from the chimney’s basement as the bottom of the 15 grate may happen to be from the hearth, which space or cavity is the only one I make for receiving such unconsumed smoke as may issue from the fire. Having so constructed the chimney, in which no particular dimension or size is requisite, I then place [the grate in the fire-place, which I do not fix quite close to the chimney, but place it so as to] leave a space marked C in the plan between its 20 back (which I shall call the back plate, marked D in the plan) and the front of the chimney before described. The grate which I so set in the fire-place may be made of the same materials of which grates are usually made, and according to any form or pattern which fancy prescribes, so that in the part which I call the back plate there be left at the bottom of it an aperture of the width of the bottom 25 of the grate and of about two inches in depth, and so that such grate be made with such projection at the sides, top, and bottom, before and behind the said back plate, as will when enclosed form a flue or chimney to convey the smoke from the top of the fire round the boiler, and descend behind the back plate, where it mixes with the heated air coming from the bottom aperture of the back plate, and is then 30 discharged into the chimney, but in grates not having a boiler over them that circuitous rout will be avoided by the smoke immediately ascending, and then descending over the back plate, and so into the chimney. And in further explanation of my said Invention, the novelty of which embraces not only the construction of the said chimney, so as to make the smoke descend and pass 35 through the heated air, and so consume itself as before particularized, but also the mode herein-after described of introducing atmospheric air to assist the draft of the fire, I do hereby declare that I erect with any materials that are fit an air shaft, marked Z in the plan, Figure 1, in a direction perpendicular, if