114 



Quantity of 

 •water headed 

 180° by it. 



Quantity of 



ice melted. 



ON THE HEAT DEVELOPED IN COMB L'STIO V. 



To express the results of this experiment so as to render 

 them obvious, and at the same time easy to be compared 

 with the results of other similar experiments, we will see how 

 much water of the temperature of melting ice would have 

 been made to boil, at the mean pressure of the atmosphere, 

 by the heat made apparent in the combustion of the l*63gr. 

 of wax burned. 



The distauce on Fahrenheit's scale between the temper- 

 ature of melting ice and boiling water being 180°, if the burn- 

 ing of r63gr. of wax were requisite to raise the temperature 

 of the water in the calorimeter 10°, the burning of 29 # 34gr. 

 would have been necessary, to raise it 180° : and, if 29'34gr. 

 of wax could furnish by combustion sufficient heat to raise 

 the temperature of 2?Slgr. 180°, a gramme of this inflam- 

 mable substance must furnish enough, to heat 94*785gr. of 

 water to the same point. 



Consequently one pound of white wax, or wax taper, 

 should furnish in burning sufficient heat, to raise 94-785lbs. 

 of water from the temperature of melting ice to the boiling 

 point. 



To find how many pounds of ice this quantity of heat 

 would melt, we have only to add to the number of pounds 

 of water at the temperature of melting ice it would cause to 

 boil the third part of this number, and the sum would ex- 

 press the weight of the ice in pounds. 



This, then, for white wax is 94'785 



+ 31-595 



, — 1 26.3 80lbs. of ice melted 

 for one pound of the wax burned. 



~ ,, Before I compare the result of this experiment with that 



i wo other ex- * _ r 



perimems with of an experiment made with the same substance by Mr. La- 

 wax - voisier, I will give an account of two other experiments I 



made with wax, as the reader will undoubtedly be struck with 

 the uniformity of their results. This is so remarkable, that 

 I should scarcely venture to publish them, had I not proofs, 

 that all my experiments were actually made and minuted 

 down, before I began my calculation of their results; and 

 were I not assured, that any person, who will follow my 

 method, using the same apparatus, will find the same results 

 on repeating my experiments. 



