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THE POPULAR SCIENCE MONTHLY. 



ference of temperature of the air when leaving the heating-chamber 

 and when re-entering the heating-chamber. 



By this system there are about fifty-five thousand cubic feet of 

 the interior of the house heated by radiation, through about thirty- 



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Fig. 2. Section op Hon9K, showing the Method op Heating : A, heatinjr-chamber ; B, open- 

 ings in heatincr-chamber communicating with flues in the interior walls leading to spaces 

 under the floors. The arrows show the direction taken by the current of air. 



five hundred square feet of floor and wall surfaces, and the capacity 

 of the heating-chamber is fourteen hundred ctibic feet, so there is one 

 cubic foot of heated air to forty cubic feet in the house. 



The temperature of the air in the heating-chamber averages, in 

 very cold weather, 170, and after delivering its surplus heat to the 

 floors and interior Avails, its temperature registers 58 in the flue 

 where it re-enters the heating-chamber for reheating, showing that 

 112 of heat had been given up and utilized for warming purposes. 

 With ordinary care in managing the furnace, a temperature of 68 

 can be uniformly maintained on the first floor, and from 60 to 62 



