11(3 On the Application of the Gas from Coal. 



The interest of the capital expended in the necessary ap- 

 paratus and buildings, together with what is considered as 

 an ample allowance for wear and tear, is stated by Mr. Lee 

 at about 550l. per annum : in which some allowance is made 

 for this apparatus being made upon a scale adequate to the 

 supply of a still greater quantity of light, than he has occa- 

 sion to make use of. 



He is of opinion, that the cost of attendance upon candles 

 would be as much, if not more, than upon the gas appa- 

 ratus; so that in forming the comparison, nothing need be 

 stated upon that score, on either side. 



The cecoiiomical statement for one year then stands thus : 



Cost of 110 tons of cannel coal - 125^. 



Ditto of 40 tons of common ditto - 20 



145 



Deduct the value of 70 tons of coak - 03 



The annual expenditure in coal, after deduct- 

 ing the value of the coak, and without allow- 

 ing any thing for the tar, is therefore - 52 

 And the interest of capital, and wear and tear 

 of apparatus - -/ ■ - - - 550 

 making the total expense of the gas apparatus > about 600/. 

 per annum. 



That of candles, to give the same light, would be about 

 2000/. For each candle consuming at the rate of 4-10ths of 

 an ounce of tallow per hour, the 2500 candles burning upon 

 an average of the year two hours per day, would, at one ' 

 shilling per pound, the present price,, amount to nearly the 

 gum of rtioney above mentioned. 



If the comparison were made upon an average of three 

 hours per day, the advantage would be still more in favour 

 of the gas light ; the interest of the capital, and wear and 

 tear of the apparatus continuing nearly the same as in the 

 former case ; thus, 



1250 X 3 = 3750 cubic feet of gas per day, which would 

 be produced by tOf cwt. of cannel coals \ this multiplied by 



the 



