GKEEX-HOUSE STRUCTURES. 



55 



been erected on this plan in all parts of the country, and 

 I have been amply repaid by receiving scores of letters of 

 acknowledgment from those who have adopted it, and 

 whose attention was first called to the plan by some of 

 the papers written by me on the subject four years ago. 



Another plan in use is shown by figure 14, combining 

 the flue and boiler, from the same furnace. This is the 

 most economical plan in which hot water can be used. 

 As shown in the engraving, there are two houses joined 

 together, each 11 feet wide by 70 feet in length. For 



Fig. 15. END VIEW OP FIGURE 14. 



colder sections of the country than the vicinity of New 

 York, from 50 to 60 feet in length would probably be suf- 

 ficient, but much depends on exposure, and the manner in 

 which the building is constructed. One of the houses is 

 heated by the flue, F; the other by the pipes, P. The 

 boiler, #, shown in the end view of the same house, 

 figure 15, is what is termed a " saddle " boiler, which an- 

 swers at the same time the double purpose of an arch for 

 the furnace and a boiler. The fire in this furnace does 

 nearly the same amount of heating as two such fires, if 

 used in heating by flues only. Thus, by this combination 

 of flue and pipes, the construction of the heating arrange- 

 ments costs about 50 per cent less than if the house were 

 heated entirely by hot water. The probable cost of two 



