406 On the Heat developed in Combustion 



quantities of heat ought to be furnished in the com- 

 bustion of one pound of oak and 0.55 of a pound of 

 charcoal. 



According to the experiments of Dr. Crawford, one 

 pound of charcoal furnishes in its combustion enough 

 of heat to raise the temperature of 57.608 pounds of 

 water 180 of F. 



Consequently the temperature of 31.684 pounds of 

 water would be raised the same number of degrees by 

 the heat furnished in the combustion of 0.55 pound of 

 charcoal. 



According to the result of the experiments of M. 

 Lavoisier, this same quantity of heat ought to be fur- 

 nished in the combustion of one pound of oak. 



Having made four consecutive experiments with 

 very good dry oak wood, and in very thin slips, burned 

 so as to give out neither smoke nor smell, and which 

 left but an inappreciable quantity of ashes and no char- 

 coal, I obtained the following results : 



It is rare to find experiments made by different per- 

 sons at distant periods, and with very different appara- 

 tus, which agree better together. 



But experiments which are well made can never fail 



