BASE-BURNING WATEIi-IIEATERS. 105 



as do our large boilers, which are not usually made on 

 the base-burning principle. The patterns they have thus 

 far made (shown in figure 26 and in section in figure 27) 

 are forty-two inches high and twenty-one inches at base, 

 and are powerful enough to heat a greenhouse ten feet 

 wide by twenty-five feet long, or about 500 square feet of 

 glass surface, taking into account the front and ends. 

 The complete cost of heating, including boiler, pipes and 

 fitting up, will range from $150 to $200. The care nec- 

 essary in the management of this base-burning water- 

 heater is exactly the same as that required for an ordi- 

 nary base-burning stove ; and it may be safely left for 

 twelve hours without attention, and will keep up a tem- 

 perature in the house of from fifty to sixty degrees at 

 night, which is about what is required for a general col- 

 lection of plants. Figure 28 shows the boiler placed 

 alongside the kitchen range, being in a basement and one 

 story lower than the conservatory. It can either be used 

 in this way, or placed in the conservatory itself if sc 

 desired. It must be borne in mind, though, in construct 

 ing a conservatory, that it must be placed where connec- 

 tion can be made with a chimney, as of course an outlet 

 must be had for smoke exactly as in any ordinary room 

 where a stove of any kind is used. When dwelling-houses 

 are heated by steam it is an easy matter to heat a green- 

 house that is attached to a dwelling, as, of course, steam 

 pipes can be run at any level above the boiler. Green- 

 houses, if need be, can be heated from the steam boiler 

 in the dwelling, even if hundreds of feet distant, always 

 keeping in view the point that, if extra work is to be done 

 by the boiler, it must have sufficient power. 



