ON THE HEAT DEVELOPED IN COMBUSTION. }\g 



Quantity of heat furnished by 1 lb. of white to the author's 



wax, during its combustion, according to my experiments, 



experiments 94*6821bs 



If we adopt the calculations of Mr. Lavoisier for the 



heat furnish. <i by carbon and hidrogen in their combustion, 



we shall have for the heat that ought to be furnished by 



the burning 



Of 0'8179 lb. of carbon, after the ratio of to Lavoisier. 



72-375 lbs. of water heated 180° by 1 lb...-. 59*195lb; 



Of 0-1191 lb. of hidrogen, after the ratio of 



221-69 lbs. of water heated 180° by 1 lb. 26*403 



Total of the heat that ought to be furnished 



by the combustible matter in 1 lb. of white ■ ■ - 



wax • • <•• 85*598 lbs 



From the results of these calculations it appears, that Crawford's " 



the estimations of Dr. Crawford agree much better with nearer . than 

 e mr t '"'• • .Lavoisier s. 



the experiments than those oi Mr. Lavoisier. 



Let us see hoc/ the results of the experiments made with Comparison of 



fat oils agree with the estimations of these gentlemen. fat olIs * 



According to the analysis of Messrs. Gay-Lussac and 



Thenard a pound of olive oil contains 



Carbon 0-7721 lb Resu i ts , 



Free hidrogen 0*1208 



According to the calculations of Mr. Lavoisier we have, according to 

 For 0-7721 lb. of carbon • -55*881 lbs. of water heated 180° Lavoisier » 

 0*1208 lb. of hidrogen 26*780 



Total 82*661 

 According to the calculations of Dr. Crawford it is t0 Crawford, 



For 0*7721 lb. of carbon •• 44*478 lbs. of water heated 180° 

 0*1208 lb. of hidrogen 49*528 



Total 94-006 



According to the experiments 1 lb. of purified rape oil to experiment, 

 furnished heat sufficient to raise 93*073 lbs. of water 180°; 

 and 1 lb. of olive oil enough to heat 90*439 lbs. 



From all these comparisons it follows, that the estima- Crawford's still 

 tions of Dr. Crawford agree much better than those of nea rest. 

 Mr. Lavoisier with the results of my experiments. 



Sect. 



