82 Of the Management of Fire 



This boiler, which is circular, is 42^ English inches 

 in diameter above, 42.17 inches in diameter below, 

 and 18.54 inches deep. It weighs 783 Ibs. avoirdupois; 

 and contains, when quite full, 714 Ibs. Bavarian weight 

 (= 884 Ibs. avoirdupois, or 106 gallons) of water, at the 

 temperature of 55. 



It is surrounded above by a wooden ring about 2 

 inches in thickness, into which it is fitted ; and in this 

 ring, in a groove about | of an inch deep, is fitted 

 a circular wooden flat cover. This cover is formed in 

 three pieces, united by iron hinges ; and one of these 

 pieces being fastened down by hooks to the boiler, the 

 other two are so contrived as to be folded back upon it 

 occasionally. From the upper surface of the part of 

 the cover which is fastened down on the boiler, a tin 

 tube 2 inches in diameter, furnished with a damper, is 

 fixed, by which the steam is carried off into a narrow 

 wooden tube, which conducts it through an opening in 

 the roof of the house into the open air. 



To prevent still more effectually the escape of the 

 heat through the wooden cover of the boiler, the upper 

 surface of it is protected from the cold atmosphere by 

 a thick circular blanket covered on both sides by strong 

 canvas, which is occasionally thrown over it. 



Though the diameter of this boiler below is more 

 than 40 inches, the diameter of its fire-place (which is 

 just under its centre) is only 1 1 inches,; but as the flame 

 makes two complete turns under the bottom of the 

 boiler in a spiral canal, and one turn round it, the time 

 required to heat it is not so great as, from the smallness 

 of its fire-place, might have been expected. 



It has ever been, and still continues to be, the decided 

 favorite of the cook-maids. 



