and the Economy of Fuel. 103 



In an experiment of which I have already given an 

 account (No. 3), 7j| Ibs. of water, at the temperature of 

 58, were made to boil in a saucepan fitted up in my 

 best manner, in a closed fire-place ; and the wood con- 

 sumed was i Ib. This gives, for the precise result of the 

 experiment, 6.68 Ibs. of ice-cold water made to boil with 

 i Ib. of the fuel. 



In another experiment (No. 1 2) made with one of the 

 small boilers belonging to the kitchen of the Military 

 Academy, fitted up on the same principles, 43.63 Ibs. of 

 water, at the temperature of 60, were made to boil with 

 3 Ibs of wood. This gives 11.93 Ibs. of ice-cold water 

 made to boil with i Ib. of the fuel. 



Again, in the Experiment No. 20, which was made 

 with a larger boiler belonging to the same kitchen, and 

 fitted up in the same manner, 187 Ibs. of water (equal 

 to about 28 gallons), at the temperature of 55, were 

 made to boil with the combustion of 8 Ibs. of fire-wood. 

 This gives 20.10 Ibs. of ice-cold water made to boil with 

 i Ib. of the wood ; and farther than this I have not 

 been able to push the economy of fuel. 



In the Experiment No. 26, a boiler was used which 

 had been constructed with the express view to see how 

 far it was possible to carry the economy of fuel in culi- 

 nary processes; and it was fitted up with the utmost 

 care, and on the most approved principles. As I 

 thought at that time that a large-sized boiler was 

 essential to the economizing of fuel, this boiler was 

 made to contain 106 gallons. In the experiment in 

 question it actually contained 508 Bavarian pounds of 

 water (or about 63 gallons), at the temperature of 48; 

 and, to make this water boil, 24 Ibs. of wood were con- 

 sumed. This gives 19.01 Ibs. of ice-cold water made 



