By Alexander Cruikshanks, Esq. 515 



heated, previous to its being pushed forward on the grate. Q is a 

 bridge formed of fire-clay in one piece, which may be removed 

 when the flue requires cleaning. The flue, instead of passing 

 through the top of the boiler, is brought out at the front, where it 

 turns upward, and is intended to be carried into a common chimney. 

 Thus the furnace and flue being fixed only to the front, and uncon- 

 nected with any other part of the boiler, the whole may be removed 

 in a few minutes should any repair be necessary. The furnace in 

 figs. 7 and 8, though well adapted for burning coke, cinders, or dry 

 wood, would perhaps not answer well for coal, as the smoke would 

 be so much chilled by contact with the metallic surface of the fire- 

 place, that the flue would be liable to become foul. This might be 

 prevented by constructing the furnace as in No. 3, figs. 9 and 10, 

 lining it throughout with fire-brick. S is an inclined plane of fire- 

 tiles on which the fuel is to be spread when first put into the 

 furnace. At T T are air- passages, between the fire-bricks and the 

 case of the furnace, leading from the front, and having openings, 

 U U, into the fire-place at the joints of the bricks above the inclined 

 plane. A regulated supply of air being admitted through these 

 openings would mix with the vapours rising from the coal, and in a 

 great measure effect the combustion of the smoke in passing over 

 the fire, and through the heated passage W. The boiler should be 

 placed within the house, either under the plant-stage, or in a pit 

 sunk below the level of the floor ; the end only being built into an 

 opening in the wall for the purpose of supplying the fire with fuel 

 from the back shed. 



I do not by any means suppose that the particular forms and 

 dimensions of the different parts, as figured in these sketches, are 

 the best that can be adopted ; my object has been merely to illus- 

 trate the principle, which I am persuaded may be so applied that a 

 much greater proportion of the heat generated by the combustion 

 of the fuel may be communicated to the atmosphere of the house, 

 vol. i. 2nd series. 3 Y 



