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32 grains of wax; or 14693^-f grains of water heated 1 degree, or 
—g. 3 = 81.631 grains heated 180 degrees, with the heat gene- 
rated in the combustion of 1 grain of wax. 
The quantity of ice-cold water which might have been heated 
j 80 degrees, with the heat generated by friction in the before- 
mentioned experiment, was found to be 26.581b. avoirdupois, 
= 188060 grains; and, as 81.631 grains of ice-cold water re- 
quire the heat generated in the combustion of 1 grain of wax, to 
heat it 180 degrees, the former quantity of ice-cold water, namely 
188060 grains, would require the combustion of no less than 
2303.8 grains ( = y-jo 0Z - Troy) of wax, to heat it 180 degrees. 
As the experiment (No. 3.) in which the given quantity of 
heat was generated by friction, lasted 2 hours and 30 minutes, 
= 150 minutes, it is necessary, for the purpose of ascertaining 
how many wax candles of any given size must burn together, in 
order that in the combustion of them the given quantity of heat 
may be generated in the given time, and consequently with the 
same celerity as that with which the heat was generated by fric- 
tion in the experiment, that the size of the candles should be 
determined, and the quantity of wax consumed in a given time 
by each candle, in burning equably, should be known. 
Now I found by an experiment, made on purpose to finish 
these computations, that when a good wax candle, of a mode- 
rate size, -J of an inch in diameter, burns with a clear flame, 
just 49 grains of wax are consumed in 30 minutes. Hence it 
appears, that 245 grains of wax would be consumed by such 
a candle in 150 minutes; and that, to burn the quantity of 
94 Count Rumford’s Inquiry concerning 
> 
were heated 2 T ~ degrees of Fahrenheit’s thermometer, with 
the heat generated in the combustion of 26 grains of wax. 
This gives 382032 grains of water heated 1 degree with 26 
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