386 On the Heat developed in Combustion 



Pounds of water raised 

 from 32 to 212. 



Of 0.1191 lb. of hydrogen, after tne ratio of 410 

 Ibs. of water raised from 32 to 212 by burning 

 I lb. of hydrogen 48.831 Ibs. 



Of 0.8179 lb. of carbon, after the ratio of 57.606 

 Ibs. of water raised from 32 to 212 by burning 

 I lb. of carbon ...... 47.116 " 



Total of the heat that ought to be furnished by the 

 quantity of combustible matter (hydrogen and car- 

 bon) in i lb. of white wax .... 95-947 " 



Quantity of heat furnished by I lb. of white wax, 

 during its combustion, according to my experi- 

 ments 94.682 ' 



If we adopt the calculations of M. Lavoisier for the 

 heat furnished by carbon and hydrogen in their combus- 

 tion, we shall have for the heat that ought to be furnished 

 by the burning 



Of 0.8179 lb. of carbon, after the ratio of 72.375 Ibs. 



of water heated 1 80 by I lb. . . . 59. 195 Ibs. 

 Of 0.1191 lb. of hydrogen, after the ratio of 221.69 



Ibs. of water heated 180 by i lb. . . 26.403 " 



Total of the heat that ought to be furnished by the 



combustible matter in i lb. of white wax . 85.598 " 



From the results of these calculations it appears that 

 the estimations of Dr. Crawford agree much better with 

 the experiments than those of M. Lavoisier. 



Let us see how the results of the experiments made 

 with fat oils agree with the estimations of these gentle- 

 men. 



According to the analysis of Messrs. Gay-Lussac and 

 Thenard, a pound of olive oil contains 



Carbon 0.7721 lb. 



Free hydrogen ....... 0.1208 



