26 



HEAT 



FIG. 15. 



Fresh air from outside circulates over the radiators and then rises into 

 the rooms to be heated. 



the cellar. Fresh air from outside enters a flue at the right, 

 passes over the radiators, where it is warmed, and then makes its 

 way to the room through a flue at the left. The warm air 



FIG. 1 6. The air which goes to the schoolrooms is warmed by passage over 

 the radiators. 



