Specification of John Chanter and John Gray : furnaces of steam boilers.

  • Chanter, John.
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Chanter and John Gray : furnaces of steam boilers. Source: Wellcome Collection.

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    5 10 15 20 25 30 35 A.D. 1835.—6920. 3 Chanter ^ Gray s Improved Furnace for Consuming Smoke, of greater width than depth where they emerge from the water chamber cl, cl, and tapering in breadth towards the centre of the boiler, increase in depth until their junction with the water spaces at o, as will be easily perceived and understood by referring to e, e, Fig® 1 and 4. We prefer them thus con¬ structed for the purpose of equalizing the action of the fire, maintaining an equal area throughout their length, and giving facility for driving the bolts or rivets through the side flanges which fix the bars to the casing of the fire box, as shewn at /, /, Fig. 4. This peculiar form is, however, not essential to the actual, and in some degree, beneficial working of the furnace, but it is the one we prefer. The water chamber and bars is connected at its upper and lower ends by flanges/,/,/,/. Fig® 1 and 4, to the inner and outer casings of the fire box, the rivits being passed, as shewn by the dotted lines r, through hoops or thimbles q, q, which may, for practical convenience, be cast or constructed either separately in the usual manner or together, when they will form a solid bearing against the tension of the rivits when passed through the two casings a, h, of the fire box, as shewn by the dotted lines at r; they also act as a stay or support to the casings of the fire box, and they facilitate repairs, as the rivits and the water chamber and bars may be easily removed and replaced at the dead plate 7i (herein-after described) whenever it becomes necessary, without disturbing the casings of the fire box. o o The water chamber extends to within a short space to the two opposite sides m of the inner casing of the fire box, as shewn at g, g, in Fig. 4, which method of construction is adopted for the purpose of simplifying the manufacture. The ♦ passage of smoke or gas from the lower fire or uncarbonized fuel herein-after described between the sides of the water chamber and the sides of the fire box is prevented by fixing a plate of iron on and to the water chamber d, d, extend¬ ing as far as the division or determination of that chamber into tubes or hollow bars fitting closely to the sides of the fire box, and covering the space between those sides and the sides of the water chamber, as shewn by the dotted lines u, u. Fig. 3. k, k. Fig. 1, is a solid metallic dead plate, having a descending flange from its sides which is rivitted to the inner casing of the fire box sufficiently close to prevent any escape or passage of smoke or gas between the joinings, and having a bracket plate m, on which one end of the grate bars I rests, their other ends resting on a horizontal bar of iron extending from side to side of the furnace, a transverse section of which bar is shewn at i. n is a dead plate rivitted to the bearing bar i, and resting at its upper side against the flange/; this dead plate is so placed for the purpose of reducing or preventing the intense action of the fire at the muzzle of the hollow bars e, which might otherwise partially prevent