and the Economy of Fuel. 



cases in which it should be advantageous to expedite 

 that process at the expense of a small additional quan- 

 tity of fuel. 



By the following experiment, in which the combus- 

 tion of the fuel was made as rapid as possible by keep- 

 ing the fire-place full of wood, and the register in the 

 ash-pit door and the damper in the chimney constantly 

 quite open, may be seen how far I succeeded in the 

 attainment of that object. 



Experiment No. 33. The boiler contained 11,368 

 Ibs. Bavarian weight of water, at the temperature of 47. 

 The fuel used was pine-wood moderately seasoned, in 

 billets 3 feet 4 inches long, and split into small pieces 

 of about i Ib. each, that it might burn the more 

 rapidly. 



This experiment was made the 2Qth of November, 

 1796, the barometer standing at 26 inches 8.7 lines, 

 Paris measure, and Fahrenheit's thermometer at 33. 



In the Experiment No. 32, the same quantity of 

 water, at the temperature of 65^, was made to boil in 



