34 



HOT WATER APPARxlTUS. 



The only other improvement in heating houses to which we shall now 

 call attention, is a boiler invented by ^Ir. Thomson of the Sion nursery at 

 Norwood. This gentleman states in a communication prepared for this 

 work, that having devoted considerable attention to this subject, and 

 tried many kinds of boilers, he turned his attention to forming one that 

 would combine the various requisite qualities of economy of fuel, with a 

 sufficient degree of heat, and which would not involve such constant 

 attention as the boilers in common use require. 



The advantages of the present invention consists in the great surface the 

 boiler presents to the action of the heat, and the introduction of a 

 check draft and flange filled with water to divide the flues. Another and 

 a very important advantage is, that between the double doors and the bars 

 of the furnace, there is a piece of iron placed, one foot three inches long, 

 by one foot Tvide, which acts as a carbonizing plate, so that when the fire 

 begins to burn strong enough to heat the iron, nearly the whole of the 

 smoke is consumed. 



Front Elevation. 



But our description will, be better understood by reference to the figures, 

 the first of which represents the front elevation of the apparatus, the various 

 parts of which are indicated by reference letters in the accompanpng 

 engravings. 



