INTERESTING THINGS ABOUT THE AIE 17 



in which the flame is blown. Their course can be traced also 

 by adding smoke to the air. The air is always in circulation 

 in a room containing a heated stove or radiator. Since the 

 air in the vicinity of the source of heat is lighter, volume for 



FIG. 16. Diagram of cookstove and water heater 



Trace the air currents through the stove and the -vrater currents through 

 the heater 



volume, than that in the other parts of the room, it follows 

 that the lower air near the stove does not have so much 

 weight resting upon it as does that in other parts of the 

 room. It is therefore pushed upward and finally reaches the 

 ceiling, when it spreads out, is cooled, and descends slowly 



