514 New Mode of applying Hot-water to heating Stoves, §c. 



half the length of the boiler, and 9 inches in diameter. From the 

 back of the fire-place, an elliptical flue, H, proceeds nearly to the 

 end of the boiler, then returns towards the front, and passes out at 

 I into the chimney K. L is a cylinder for supplying the boiler with 

 water, and allowing for its expansion when heated ; M M the water- 

 pipes, (shewn in section at fig. 5) connected with the boiler by 

 screws and flanges at O O. These pipes are elliptical, which 

 shape combines in some measure the strength of the circular with 

 the extended surface of the flat form. The pipes are only 12 feet 

 long; but the circulation is so rapid that the boiler would serve for 

 a much greater length. N is an air-pipe. 



This small apparatus has answered so well, and appears to offer 

 so many advantages over a boiler set in brick work, that I have 

 been led to consider how the plan may be improved upon and 

 applied to heating houses of large dimensions with any sort of fuel. 

 This I think might be accomplished by constructing the apparatus 

 according to one or other of the plans Nos. 2 and 3, where the 

 same general principle is followed as in that already described ; but 

 the boiler and furnace are so formed that a smaller quantity of 

 water is contained between them compared with the surface exposed 

 to the heat from the fire, and the arrangement of the parts is better 

 calculated to promote a rapid circulation of the water in the pipes. 

 For this purpose the cylinder L, instead of being placed at the 

 same end of the boiler as the pipes, is removed to the opposite end, 

 and the upper pipe is connected with it ; consequently the water 

 enters from the lower pipe at one extremity of the boiler, passes 

 through its whole length over the surfaces of the furnace and flue, 

 becoming gradually heated in its passage, and then rises through 

 the cylinder into the upper pipe ; thus flowing in a constant and 

 regular current through the whole apparatus. In fig. 8, the front 

 of the fire-place, where ignited fuel would be inconvenient, is 

 occupied by a large fire-tile, P, on which a supply of fuel may be 



