Description of a Stove. dO? 
are made to give a more rapid passage to tlie heat pro* 
duced. This is not totally without foundation, since the 
temperature of the air issuing from them is increased by 
the heat it absorbs from the stove ; and on this account 
some might be disposed to neglect them, as contrary 
to the most essential object, that of retaining the heat in 
it ; but it is to be observed, that we can shut these out- 
lets when we please ; and that we may even cut off all 
communication with the external air by means of a simple 
slider ; so that every advantage may be derived from them 
without any inconvenience. It must be added, that they 
are necessary in very close apartments, unless we would 
expose ourselves to currents of cold air. These reasons 
have induced me to employ the heat openings in the Swe- 
dish stove, to which they had not been applied. 
The Swedish stoves are constructed strictly according 
to the truest principles, and the pipes in which the smoke 
circulates, are disposed in the best manner for effecting its 
complete combustion. Their utility has been found so 
great, that they have become general in Sweden, where 
the winters are v#ry severe, and where they have dimi- 
nished the consumption of wood one third, so that there 
is no country where the inclemency of the weather is 
guarded against at less expense. They have likewise 
been employed advantageously, with the necessary varia- 
tions of form, in dye-houses, breweries, &e. 
Their construction is by no means expensive ; they 
save iron-work, and require only bricks or tiles. These 
are recommended to he placed edgewise, and chosen as 
thin as possible for the inner walls. The circulating 
pipes are to be placed so, that rain falling down the chim- 
ney can never get into them. The method of using them 
is so easy, that in the largest public buildings one person 
is sufficient to light all the fires. All the w ood that can 
b* contained in the fire-place, which is very small, is to 
