392 On the Heat developed in Combustion 



(= o. 22 1 2) being only water, which does not burn, to find 

 how much water would be raised from the temperature 

 of melting ice to that of ebullition by a pound of the pure 

 alcohol of Lowitz, we have only to divide the quantity, 

 that is, the measure, of the mean heat developed in the 

 experiments with the spirit of wine by the fraction that 

 expresses the quantity of alcohol in a pound of this 

 liquid. 



Thus, we have |^ = 67.558 pounds, the measure of 

 the heat developed in the combustion of one pound of 

 pure alcohol of Lowitz, according to the mean result 

 of the experiments made with spirit of wine. 



In two experiments made with the alcohol of the shops, 

 the mean result was 54.218 pounds; and, as this con- 

 tained 0.8057 pound of pure alcohol, we have for the 

 measure of the heat developed in the combustion of 

 i pound of pure alcohol ^^ = 67.293 pounds of water 

 heated 180 F. 



Of three experiments made with the alcohol at 42, the 

 mean result was 61.952 pounds of water heated 180 F. 

 by the heat developed in the combustion of one pound 

 of this liquid. 



Hence, I pound of pure alcohol should furnish heat 

 enough in burning to raise 67.57 pounds of water 180 

 F.; for Hf = 67.101. 



Taking the mean between the results of these eight 

 experiments with three alcoholic liquors, we shall have 

 for the measure of the heat developed in the combustion 

 of one pound of pure alcohol of Lowitz 67.317 pounds 

 of water raised from the temperature of melting ice to 

 that of ebullition. 



It will be extremely interesting, no doubt, to know 

 whether this quantity of heat agree with the quantities 



