296 Researches upon Heat, ^c. 



As the experiments made with wax have given very 

 uniform results, and as the analysis of this substance has 

 been effected with great care, I shall show how the quantities 

 of hydrogen and carbon which arc found in this substance 

 agree with the quanlity of heat which it furnished me in 

 combustion. 



According to the analysis of Gay-Lussac and Thenard, 

 one pound of this substance contains 



g^'-b""- o-?;'npound. 



free hydrogen.. O-llQlJ ^ 



If we adopt the calculation of Mr, Crawford both as to 

 the heat I'urnished bv the hydrogen^ and that furnished by 

 the carbon, we shall have : 



For the heat wliich ought to be furnished by 

 08179 pound of charcoal, at the rate of 57'Co6 

 pounds of water at the freezing point made to boil, ^"""baihiT"" 

 per pound of charcoal burnt 47*116 



For the heat which ousiht to be furnished in the 

 combustion of 0-1191 pound of hydrogen, at the 

 rate of 410 pounds of water boiled, per pound of 

 hydrogen burnt 48"831 



Total heat which ought to be furnished by the 

 quantities of conibuslible matters (carbon and 

 hydngen) which arc found in one pound of bees 

 wax 95947 



Quantity of heat furnished by one pound of 

 bees wax in its combustion, according to my ex- 

 periments 94'662 



If v\e adopt the calculations of M. Lavoisier, for the heat 

 furnished bv the carbon and hydrogen in their combusiionj 

 we shall have : 



For the heat which ought to be furnished by 

 0'8179 pound of charcoal at the rate of 72-375 

 pounds of water heated ! SO- per pound 59*059 



For that which ought to i)e kunished 'ny 0" 1 191 

 pound of hydroucn at I'le rale of i'21'dJ pounds 

 water 180° per pound 26*403 



Total heat which ouiiht to be furnished by the 

 combustible matter in one jiound of bees wax . . . f 5*462 



From the results of these calculations, u will be seen 

 that those of M.r. CiAwi(;rd aoree much belter with my ex- 

 periment- than those i)i M. Lavdisier. 



Let us now see liow the results of the experiments made 

 with the fat oils agree with the estimates of Messrs. La- 

 voisier and Crawford. Ac- 



