504 Of the Management of Fires. 



one year, or 365 days, 182^ Ibs. would be required, and 

 that quantity, at I farthing the pound, would cost 182$ 

 farthings = 45 1 pence, or three shillings and ninepence 

 half-pi)i)iy and half a farthing. 



Were it possible to heat so small a quantity of water 

 with the consumption of the same proportion of fire- 

 wood as was found to be sufficient for heating water 

 in some of the experiments, of which an account is given 

 in the sixth Essay, the annual expense for fire-wood, for 

 boiling water for making tea for two persons twice a 

 day, would amount to no more than 57 Ibs. weight, 

 which, at the London price of this wood, one farthing 

 in the pound, would cost 57 farthings, or one sJiilling 

 and twopence farthing. 



It is by computations of this sort, founded on the 

 results of unexceptionable experiments, that we are 

 enabled to appreciate the vast saving to individuals 

 and to the public that would result from proper atten- 

 tion being paid to the management of fire and to the 

 economy of heat. 



[This paper is printed from the English edition of Rumford's Essays, 

 Vol. III., pp. 455-471.] 



END OF VOL. III. 



Cambridge : Press of John Wilson & Son. 



