72 Of the Management of Fire 



1 2 inches in diameter ; and the boiler being seated on 

 the top of the wall of this cylindrical fire-place, the 

 flame, passing through a small opening on one side 

 of the fire-place, at the top of it, made one complete 

 turn about the boiler before it was permitted to go off 

 into the canal by which the smoke passed off into the 

 chimney. 



Though there was no damper in this canal, yet as its 

 entrance or opening, where it joined the canal which 

 went round the boiler, was considerably reduced in size, 

 this answered (though imperfectly) the purpose of a 

 damper. This fire-place being completed, and a small 

 fire having been kept up in it for several days to dry 

 the masonry, the experiment was made by preparing 

 the same quantity of the same kind of soup in this and 

 in a neighbouring boiler whose fire-place had not been 

 altered. 



The food cooked in each was 89 Ibs. of peas-soup ; 

 and the experiment was begun and finished in both 

 boilers at the same time. 



The wood employed as fuel was pine ; and it had 

 been thoroughly dried in an oven the day before it was 

 used. 



The boilers were both kept constantly covered with 

 their double covers, except only when the soup was 

 stirred about to prevent its burning to the bottoms of 

 the boilers. 



