108 Descrijition of a Stove . 
be put in at once $ it is to be sawn into pieces of equal 
lengths ; and as soon as it is burned,, the slider that stops 
the coniiiiunieation of the circulating pipes with the chim- 
ney is to be thrust in. By these means all the heat, which 
the fuel is capable of producing, remains in the pipes, and 
issues out slowly, and only to diffuse itself in the apart- 
ment ; while a single piece of wood, that had not burned 
at the same time with the rest, would oblige the slide to 
be left open, and the current of air necessary for its com- 
bustion would carry off into the chimney the greater part 
of the heat produced. 
The following is a description of the stove constructed 
under my directions. 
Fig. 1, Plate 8. represents a front view of the stove : 
its height is I6d centimetres (about 61 inches French,) 
exclusive »of the vase, which is a separate ornament, 
merely placed on the top. 
Its breadth is 85 centimetres (about 31f inches.) 
Its depth 58 centimetres (about %i\ inches.) 
The height may vary according to the size of the 
apartment, and be extended without inconvenience to two 
metres (about 6 feet 2 inches.) It may likewise be re- 
duced, as I have done for stoves in a laboratory, which 
were to support a sand bath as high as the hand. 
The other two dimensions are determined by those of 
the bricks employed to form the interior circulatory pipes, 
which should be in certain proportions, that the smoke 
may pass through them freely, without so much air enter- 
ing with it as would condense it, or sink the temperature 
below the degree necessary for combustion. 
Y Y are the external parts of the two heat openings. 
m m Apertures of the stove, by which the air, that is 
to issue through the heat openings, enters. These are 
closed when the air is drawn from without through a pipe 
passing under the floor ; which is much more advanta- 
