_ Exp. 2. The air was now 26°; parlor, 70°; the air at top, 1189; 
diece feet below, 123°; six feet below, 131°; nine feet below, 1879; 
ten and and a half feet below, 139, showing an average diminution of 
2° per aed in the height of the. cheney as the gas a 
— 
Exp. 3s This was a bold day and a brisk oui was pia 
The. air was at 18°; the parlor, 75°; gas at the top, 180°, and 
twenty one feet heleats 220°, showing a diminution of 1,9;° for each 
foot of the height, and anes that the gas had, at its escape, 
nearly thrice as much excess above the surrounding air, as any 
room in the house. The ieipeians at which the gas escapes, 
must obviously depend upon the state of the fire, as well as upon the 
quantity of unburnt air, which obtains admission above it. When the 
fire door of the stove is open, the air enters rapidly and mixing with 
the gas, partakes of its heat, but probably derives from the fire above 
which it passes, a small part only of its ultimate temperature. The 
same is true of the air which enters at the throat of a chimney, be- 
neath which a grate is in action. The air which approaches to mix 
cold until the moment of penis, the throat, 
mira ha te I If eos Lara edeeeaiee 
ry to receive the gas, a greater proportion of the air of the 
room . will there find an outlet, and the useful effect of the fuel will 
be neutralized by sending up the chimney that air which it was the 
chief purpose of the fire to warm, in order that it might be retained 
in the apartment and applied to its occupants. 
_. Exp. 4. This experiment was made upona cna, the gas from 
which was derived from an open grate in the basement, and of course 
contained much common air, mixed with the products of combustion. 
The open air was at 50°, the escaping mixture at 120°. 
. Exp. 5. A similar examination of another. chimney. fed by a large 
Kishen. range in full action, gave 125° for the - ar 
gas, that of the open air being 45°, The foregoing experiments 
Served to indicate, that the gas of a close stove, if not of an open 
grate, might be usefully employed to warm an additional apartment, 
since it constantly escaped at.a much higher temperature than it 
could be desirable to maintain in any part of a dwelling. 
«To effect the proposed saving, it was only necessary to arrest the 
gas by a partition at the Prope point, peer ate the side of the chim- 
Vou. XXIII.—No 2 
