Specification of John Forbes : constructing fire-places with double grates, &c.

  • Forbes, John.
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Forbes : constructing fire-places with double grates, &c. Source: Wellcome Collection.

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    Forbes Improvements in Burning or Consuming Smoke. recess or fire place in which the grate is set. Y is a partition wall of brick¬ work, built so as to leave a space between the back of the grate and the back of the chimney recess, which is to form an air chamber X, to receive the great warmth from the heated iron back of the grate, which, with the heat from the 5 fire, rapidly warms the brick flue or chimney, and when sufficiently so rarefaction is kept up and the draught is thereby increased; the flue, on account of the great heat, becomes impervious to cold, and thus I prevent the wind from rushing downwards, and also the smoke and heat being thereby blown into the room. It may be well here to state that similar letters are used to denote similar parts in all 10 the Figures, a, a, is the front of the grate; b, b, casing, behind which the blower slides down to the top bar of the upper fire, d is the space for the fuel of the clear fire, having extra backs, as is usual; under it is the fire C of coal; e, opening into the flue; /, the blower handle; g, the recess in the -iron back; h, h, the pulleys, k, k, are the jamb fronts ; m, m, the cheeks or covings, 15 made straight or curved on plan; n, back of grate; P, the iron tube; Q, Q, chambers for hot air; II, the dust pan; t, grooves in which the blower moves. Figure 3 is the section and profile of the grate. Those parts colored red show the brick at the front and back of the chimney flue. Z is the flue; X is the chamber for heat from the iron back; Y is the brick separating the 20 chamber from the grate ; a, a, the frame in front; b, b, the case in front of the blower; c, bottom of the 1 ower fire grate, made to slide horizontally in grooves to take off, if required; d, bottom of the upper fire grate; e, the entrance for the draught, &c. through the iron tube P into the chimney; f, handle of the blower ; g, the recess at the back of the two grates; h, the pulleys ; 25 m, the cheeks, made curved or straight on plan ; n, the back of the grate, made to open at bottom, or to take off at top, for the purpose of cleansing the flue; 0, flat top ; P, iron tube; R, the dust pan; r, the blower; S, the cap over the tube; t, t, the grooves, in which slides the blower. In making use of my* said Invention it is only necessary to observe that the upper fire should be 30 lighted first, and should be made of coke, stone, coal, cinders, or charcoal, but f mixed at first lighting with a little bituminous coal, it will ignite better and more quickly, when a bright clear fire is obtained in the uper grate keep it well fed, and a fire of any bituminous coal may be lighted in the lower grate. The recess g in their on back allowes the smoke and flame of the under fire to 35 pass better into the upper one, where, by the aid of the quickened draught, the clear fire burns or consumes the smoke, the blower being lowred as occasion may require. Now whereas I claim as my Invention the arangement of one fi re grate over another, with the recess g communicating with both, in manner aforesaid,