HEATING. 



6l 



possible amount of direct heating surface, and 

 offering the least resistance to the movement of 

 the water, and a fire box deep and big enough to 

 carry a large amount of fuel at slow combustion. 



19. Interior construction. Method of connecting returns 

 at north end of house. 



There is no economy in curtailing the size of 

 the fire box and adding sections, which at best can 

 only receive the hot gases. In order to get the 



