APPLICATION OF HEAT. 
11 
The figure is designed to exhibit the form and position of the oven boiler, and its 
principal appendages, but not by any means to portray the external fittings-up, 
which are indeed most complete, as they comprise two side flues, with close iron 
doors, by which, with little trouble, the soot that collects around the boiler, and at the 
entrance of the shaft, can be removed, thus avoiding future repairs or alterations. 
A breasting of brick work is erected, from which springs a bold arch, and upon this 
the chimney is supported, and thence is carried up to any convenient height. By 
referring to fig. 2, some idea will be formed of the plan of tanks through which pass 
the right and left return-pipes, r r, that convey the water through the two branches 
that communicate with the two sides of the boiler. F shows the position of the boiler 
in the small house that is under erection, but which cannot be minutely described in 
its inner details till the weather permit its completion. 
The plan of fig. 2 is by no means arbitrary, for it manifestly admits of many 
deviations. The apparatus it includes is fully adequate to warm a large house, 
either with or without a single or double tank. The four ranges of three-inch bore 
cast-iron pipes, which pass around the walls and down the middle, as above shown, 
excite an atmosphere of warm air that must be nearly equable throughout, and sus- 
ceptible of increase or diminution by the complete regulation of the combustion pro- 
vided for. The roof also may be a ' lean-to,' or simply sloped, or a double span, facing 
north and south, or south-east and north-west (which, perhaps, are the choicest aspects). 
If the objection be raised, that so large a furnace (measuring above two feet in 
length, if we include the heating plate in front of the bars,) must require a very con- 
siderable mass of fuel, it may be met by the assertion that a small capacity requires 
the very best quality of coal, and frequent feedings ; whereas, when a large body of 
fuel becomes red hot, it can be supported by cinders, and other cheap and even refuse 
material. So far as observation extends, the promise is most encouraging, but as we 
neither entertain prejudices nor prepossession, a truthful report shall be added when its 
heating and economising powers shall have been ascertained. 
Having said so much in recommendation of the furnace above described, which 
till proved defective affords the highest promise of efficiency, it will be just to 
