HEATING. 



Boiler makers, under the stimulus of competi- 

 tion, have, in many cases, wandered away from 

 the simple principles that must be considered 

 in making 1 an economical, efficient apparatus. In 





17. Interior of house, showing method of connecting- 

 flow pipe with four returns. 



our experience with boilers we have never found 

 any that would fill all requirements so nearly as 

 one of simple construction, giving the largest 



