Jan. 27,1888.] 



SCIENTIFIC NEAVS. 



75 



HOT AIR STOVES. 



OT air^stoves are not nearly so extensively used 

 ■■""in this as in other countries. This is partly due 

 to a preference for open grates, and partly to the more 

 extended use'of hot water circulated in pipes ; but also 



H 



mical working of such a stove generally involves heat- 

 ing the air to a much higher temperature than comfort 

 and health require, the objection to it is not founded on 

 mere unreasoning prejudice. For domestic use we may 

 say at once that we consider highly-heated close stoves 

 most unsuitable, even when pans of water are used 



largely to the dislike of any system which heats the 

 air excessively. There are, however, two classes of hot air 

 stoves, one in which the air is heated by coming in con- 

 tact with the external surface of the stove, the other in 

 which the air is heated chiefly by sweeping through 

 passages in the interior of the stove. In the former the 

 heating surface is comparatively small, and as the econo- 



to supply moisture to the air. We have no wish to 

 exaggerate the importance of this question, but the 

 ventilation of a room is, or ought to be, so intimately 

 associatedlwith its heating, that we cannot refrain from 



SECTION AT LI. 



Fig. 3. 



mentioning certain well-known facts. As we pointed 

 out on a former occasion,* our comfort depends greatly 

 not only on the warmth of the air we live in, but on 

 its feeling sufficiently dry or moist, as the case may be. 

 By this it must not be supposed that the quantity of 



* Vide Old Series, No. 3, p. 59. 



