Apparatus for heating Hot-houses. 



295 



" a a a {fig. 44'. a and b) is a coil of tubing, which is placed within thd 

 furnace, as shown in the drawing ; ^ is a tube by which the water passes 

 from the coil a, when in a heated state ; and c is the tube by which the 

 water is returned to the coil, after having given off the heat, to effect the 

 object to which the apparatus is applied, whether for heating the air in 

 buildings, evaporating fluids, or heating metal, as will be more fully 

 described hereafter. 



" The furnace consists of two compartments, d and e ; the compartment 

 d is that in which the fuel is burned, and the compartment e surrounds that 

 at d, and is a sort of hot chamber in which the coil of tubes (a) is placed, 

 and the water therein becomes heated by the heat which is generated in 

 the compartment d, the smoke and heated air passing from the ignited fuel 

 at /into the compartment e, and thence into the chimney (g). 



" The description of fuel which I prefer is coke or stone or other coal, as 

 free from bituminous matter as possible, which is put into the compartment 

 dy at the upper part at h, over which there is placed at all times a cover, to 

 prevent any draft passing in that direction ; by which means, when the fire 

 is lighted, and the fuel is filled up to the top of the compartment d, and 

 the opening at h covered, the air which produces the combustion will pass 

 up through the fire bars at /, and the fuel on such bars will in a short time 

 become an ignited mass : j is an opening or door in the front of the furnace, 

 by which the same may be stoked, or the fire lighted. 



" c, D, E {fig. 45.) show the manner in which I construct the joints of the 

 apparatus, which are shown on a larger scale, for the purpose of making 

 them more clear, c {fig. 45.) shows in section the manner of connecting 



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