Specification of Thomas Preston, junior : fire-places for steam boilers.
- Preston, Thomas, junior.
- Date:
- 1854
Licence: Public Domain Mark
Credit: Specification of Thomas Preston, junior : fire-places for steam boilers. Source: Wellcome Collection.
7/8 page 3
![Prestons Improvements in Fire-places for Steam Boilers, $c. which supports the brickwork over the ash hole. A, Figure 3, end view section of same boiler; A, A, the boiler; B, B, opening or flue; C, C, C, C, brick¬ work ; H, fire-place; I, fire bars; K, bearing bars; M, M, M, brickwork over the boiler; N, N, N, space betwixt the brickwork and upper part of 5 boiler ; 0, 0, cast iron plate to cover flues ; C, C, water line; a, a, the lumps supporting the boiler, shewn by dotted lines. For melting lead, tin, &c. I place the pans exactly in the same position as the boilers before described, only that I bring the fire fairly over them, the smoke being carried off, as before men¬ tioned. The Drawings B, Figure 1, 2, 3, and 4, are four views of a melting 10 pan for lead, &c. Figure 1, ground plan; A, the melting pan, of cast iron * or any other fit material; B, B, B, B, the opening or flue ; C, C, C, C, the brickwork ; D, the spout for discharging the pan; E, a hopper made of cast iron or any fit material round the spout to preserve the brickwork; F, F, flues to the chimney; G, the damper; H, the chimney flue; I, I, I, brickwork of ] 5 chimney; 0, hopper for feeding the fire, shewn by the dotted lines; a, a, a, a, fire-place, shewn by the dotted lines ; b, b, b, b, four lumps to support the pan, shewn by the dotted lines. B, Figure 2, shews a side-view section of the melting pan; A, the pan; B, B, opening or flue; C, C, C, C, brickwork; F, flue to the chimney; G, damper; H, chimney flue; I, I, brickwork of 20 chimney; K, furnace bars; L, L, bearing bars; M, M, iron cover; N, iron door in the cover; 0, 0, two cast iron hopper holes; the upper one to admit of a slice or poker, and the lower one to feed the fire; P, the fire-place; C, C, C, C, four doors of cast iron or any other fit material to the two hopper holes 0, 0 ; b, b, the lumps supporting the pan, shewn by dotted lines; Q, the 25 arch to give air and save brickwork. B, Figure 3, is an end view section of the pan; A, the pan; B, B, opening or flue; C, C, C, C, brickwork; D, the spout; E, iron hopper round the spout; K, furnace bars; L, bearing bars; M, M, iron cover; N, door to cover; P, fire-place; Q, a lever (of a convenient length) with a plug at the end next the spout to stop up the mouth of the 30 spout till the pan is required to be discharged ; R, the screw nutts and spindle upon which the lever Q is marked; S, the plug attached to the lever Q, to which it is fastened by a key at a; T, the extreme end of the lever; V, a weight in which may be moved upon the lever Q; W, a vessel of any con¬ venient form to receive the discharge from the pan. B, Figure 4, is the iron 35 cover; M, M, the cover cast in two peices, the division of which is shewn at a, a, a, a; N, the door. When the pan is required to be discharged the weight should be drawn down to that end of the lever next the furnace, and the end at T raised up, which will of course draw the plug; the reverse of this should be adopted in closing it again.](https://iiif.wellcomecollection.org/image/b30742675_0007.jp2/full/800%2C/0/default.jpg)
