WATER-HEATER. 



103 



CHAPTER XXI. 

 BASE-BURNING WATER-HEATER. 



For many years a great want has been felt for a better 

 means of heating greenhouses, or rather conservatories, 

 attached to dwellings. The space to be heated is usually 



Fig. 26. BASE-BUKNEB. Fig. 27. SECTION. 



BO small that the ordinary hot water boilers in use for 

 large greenhouses have been found by amateurs too compli- 

 cated, and to require too much attention. Then, when 

 the common smoke-flue was tried, corresponding difficul- 

 ties arose ; it requiring nearly the same attention as the 



