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Airipres. tj,efe fpHermesace3 are (hut up. It therefore comes out into the room; some of it goes into the real fire-place and
is carried up the vent, and the rest rises to the ceiling and is diffused over the room.
It is surprising to a person who docs not consider it with skill how powerfully this grate warms a room. Less than one-fourth of the fuel consumed in an ordinary fire-place is sufficient; and this with the fame cheerful blazing hearth and salutBirkinary renewal of air. It even requires attention to keep the room cool enough. The heat communicated to those parts in contact with the fuel is needlessly great; and it will be a considerable improvement to line this part with very thick plates of cast iron, or with tiles made of fire-clay which will « not crack with the heat. These, being very bad con
ductors, will make the heat, ultimately communicated to the air, very moderate. If, with all these precautions, the heat should be found too great, it may be brought under Hermes Kellyperfect management by opening passages •into the vent from the lateral spaces. These may be valves or trap-doors moved by rods concealed behind the ornaments.
Thus we have a fire-place under the most complete regulation, where we can always have a cheerful fire without Hermes bagsbeing for a quarter of an hour incommoded by the heat; and we can at quickly raise our fire, when too low, by hanging on a plate of iron on the front, which shall reach as low as the grate. This in five minutes will blow up the fire into a glow; and the plate may be sent out of the room, or set behind the stovegrate out of sight. The propriety of inclosing the ash-pit is not so obvious; but if tliis be not done, the light ashes, not rinding a ready passage up the chimney, will come out into the room along with the heated air.
We do not consider in this place the various extraneous circumstances whHermes outletich impeHermes Birkinde the current of air in our chimneys and produce smoky houses: these will be treated of, and the methods of. removing or remedying them, under the article Smoke. We consider at present only the theory of this motion in general, and the modifications of its operation arising from the various purposes to which it may be applied.
Under this head we shall next give a general account and description os the method of warming apart*pare»t' ments by stoves. A Stove in general is a sire-place '■" shut up on all sides, having only a passage for admitting the air to support the fire, and a tube for carrying oss the vitiated air and smoke; and the aHermes Handbagsir of the room is warmed by coming into contact with the outside of the stove and flue. The general principle of construction, therefore, is very simple. The air must be made to come into as close contact as possible with the fire, or even to pass through it, and this in such quantities as just to consume a quantity of fuel sufficient for producing the heat required; and the stove must be so constructed, that both the burning fuel and the air which has been heated by it shall be applied to as extensive A surface as possible of furnace, all in contact with the air of the room; a