ARTIFICIAL HEAT AND APPARATUS. 43 



conveyed around the house in a flue, which almost nullified 1 

 the improved principle, but of late years a great improve- 

 ment has been accomplished, so much so, as to make it al- 

 most perfect. After having been acquainted with nearly all 

 kinds, I have, not found any to give so much satisfaction 

 as the one constructed by A. E. Hitchins, of New York, 

 of which fig. 11, is a longitudinal section, and fig. 12 an 



Fig. 11. Fig. 12. 



external view. This boiler is a double casing, between 

 which, and the internal connections, the water is con- 

 tained. It occupies very little room, and requires no 

 inasonwork, excepting a few courses of bricks below, to 

 raise it up sufficiently to give an ash-pit underneath, and 

 a chimney or pipe to convey away the smoke. This 

 apparatus when completed, with pipe four inches in dia- 

 meter, boiler included, will cost from one dollar to one 

 dollar twenty-five cents per lineal foot on the measure of 

 the pipe, and a house forty feet long for early forcing 

 would need about two hundred feet, so that reckoning the 



