186 S. Webber on Ventilation. 
apartment, since all the caloric communicated by the inclosed air 
to the outer plates of the stove is radiated by them into the room, 
forming no inconsiderable addition to its warmth. 
Still this kind of stove requires a large, free, and pretty direct 
passage for carrying off the smoke of the fire; and this also 
permits the escape of a large portion of the caloric produced by 
it, so that they are decidedly less economical than close stoves, 
where only a small opening is left for the indraught of the air 
from the room to the fire, to maintain its active combustion: 
through which small! opening the current is so strong, that a much 
less sized smoke pipe is required, and this may be much more 
tortuous in its approach to the chimney flue, thus carrying from 
the stove less of the caloric, and permitting a considerable part of 
what it does receive, to escape by radiation from its sides. . If a 
comparatively large stove of this kind be used, with a good 
same way as was mentioned for open stoves. Stoves of this 
kind»made of soapstone or porcelain, are preferable to those made 
of iron; but if the latter be large and but moderately heated, 00 
essential evil will arise from the material. When the polish with 
which it is customary to-coat iron stoves, readily gets brown oF 
ash colored, it is evidence that the stove is far. too highly heated. 
Double close stoves made of ‘soapstone have lately come into pat- 
tial use, and their performance is in all respects very unexcep- 
tionable. : 
Air-tight stoves are excellent as to economy of fuei, but this is 
their only merit. ‘They impart warmth-ia the highest possible 
degree, but in themselves do nothing for a change of air, neither 
carrying off any noticeable quantity of foul air, nor supplying aby 
fresh warm air. These defects are the same with those of close 
stoves but in the highest degree, and they may be remedied in the 
same way ; the ventilating opening into the chimney should how- 
ever be larger than in a common close stove. The very perfection 
er with which they irepart their caloric to the room, 1s 2 Sel 
eked 
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