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.

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    Gregsons New Method of Constructing Chimneys, <fyc. possible, from the basement of the hearth to the house top, and on either side of but to run parallel with the chimney, unless it happens there should be an external wall near to and at the back part of the hearth or fire-place, in which case I terminate it in the nearest convenient part thereof, as at Y in the plan 5 and in order to effect a communication between such air shaft and the fire, as well as to observe uniformity, I make apertures in the hearth stone, marked X in the plan, at the foot of each of the jambs or piers of the fire-place, and carry the air shaft underneath the floor or hearth stone, as at I in the plan, till it is connected with both the said apertures, and I make the dimensions of the 10 said apertures in all cases to correspond with the dimensions of the aper¬ ture B in the chimney and the said air shaft to encrease gradually in dimen¬ sion from the said aperture X until it goes to the top; and to increase or diminish at pleasure, as well as equally distribute the air which will be so admitted by such air shaft, valves or dampers capp’d with fret-work may be 15 placed over such apertures, which by means of turning a screw or handle will have such regulating effect accordingly. And I further declare that my mode of supplying fires with fuel (which applies principally to furnaces and other large fires) is as follows: presuming that the bars of a furnace in which a fire is to be made to extend three feet wide, I place it at its front or mouth, twelve 20 inches higher than the grating a bed plate marked E, Figure 1, in the Drawing hereunto annexed, of the following dimensions, namely, three feet in the clear between the brickwork from side to side, and eighteen inches from front to back, and three quarters of an inch thick at least, and I make the said bed plate to rest its sides in and upon brickwork, as at H in the plan, Figure 1, to 25 be raised and carried a sufficient length and heighth further than the fire s mouth, so as to be capable of supporting the same, and to fill up the under space of twelve inches left between the said bed plate and the grating. I make a door of iron, marked F in the plan, Figure 1, to open and shut in the usual way, the only purpose of which door, however, is to facilitate the making 30 and raking of the fire. On such bed plate I make a rail, which I call a sliding rail, with a shelf, both which rail and shelf, marked K. in the plan, Figure 1, are rivited together, and are three feet from end to end; the rail is five inches high, standing nearly in a perpendicular direction, and the shelf is seven inches wide, but laid in an horizontal direction, or parallel with the 35 bed plate, and I attach such rail by screws, bolts, and rivets to the nearest centre of a double eliptic spring, as at L, Figure 2, in the plan, the other centre M in the plan being fastened to a block, which is made stationary by the frame work constructed as kerein-after mentioned. At about the distance of nine inches higher than the shelf I place^a box, marked in the plan P, Figure 1,
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