Specification of John Ferguson : furnaces and fire-places.

  • Ferguson, John.
Date:
1854
Catalogue details

Licence: Public Domain Mark

Credit: Specification of John Ferguson : furnaces and fire-places. Source: Wellcome Collection.

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    Fergusons Improvements in Furnaces and Fire-places, <§c. furnace or fire place, whether for steam purposes or not; and in order that my said Invention may be properly understood, I shall now pro¬ ceed to describe the several Figures on the Sheet of Drawings hereunto attached. Figure 1, on the Sheet of Drawings is a front end elevation 5 of a steam boiler and furnace arranged according to one modification of my Invention; Figure 2, is a vertical longitudinal section of the same taken through the centre of the boiler; Figure 3, is a vertical trans¬ verse section, one half taken through the air space immediately in front of the apertures by which the air enters the main flue, and the other 10 half taken a little behind this, where the entering branches of the air passage bend in towards the centre line of the furnace ; Figure 4, is a horizontal longitudinal section of the furnace, one half being taken at two different levels through one of the air passages, and the other at a higher level, so as to exhibit the route of the main flue. The boiler A, 15 which I have selected for representation in combination with my im¬ proved furnace, is of the ordinary cylindrical form, having hemispherical ends. It is embedded in a rectangular structure or seat of brickwork B, in which are formed the furnace, flue, and air passages. The grate C, is at one end of the boiler, and the main flue D, issuing from it at the back, 20 first passes over the bridge E, and then under the hanging bridge F; after this it runs along under the boiler until it reaches its its back end, where it takes a turn upwards to the left hand side, as at G, and returns along this side of the boiler to the front at H it next runs back along the right side of the boiler, and finally passes off* to the chimney at I. 25 The entrances to the air passages, of which there is one on each side of the furnace, are at J, a little below the level of the fire bars. These entrances are provided with throttle valves or adjustable passages K, for adjusting the indraught of air, the spindles of the valves passing through the brickwork into the ashpit, where they have lever handles 30 L, fixed upon them, by means of which they can be set in any required position. These air passages pass horizontally and parallel with the boiler’s axis, to a short distance behind the hanging bridge F, they then turn inwards as at M, and continue their course towards the back end of the boiler, as at N, immediately below the main flue D, being sepa- 35 rated from this last by a very thin partition 0. On reaching the back