92 GASS LIGHTS. 



of about 1230 ale gallons, which not having been yet sold, I can. 

 not detenriue its value; but whenever it come., to be manufactured 

 in lai,:- quantities, it cannot be such as materially to influence 

 the economical statement, unless indeed new applications of it 

 should be discovered. 



The quantity of aquens fluid which came over in the course of 

 the observations which I am now giving an account of, was not ex. 

 artly ascertained, from some springs having got into the reservoir ; 

 and as it has not been yet applied to any useful purpose, I may 

 omit further notice of it in this statement. 



The intt rest of the capital expended in the necessary apparatus 

 and buildings, together with what is considered as an ample allow, 

 ance for wear and tear, is stated by Mr. Lee at about 550. per 

 annum : in which some allowance is made for this apparatus being 

 made upon a scale adequate to the supply of a still greater quan- 

 tity of liulit. than he has occasion to make use of. 



]!c is of opinion, that the cost of attendance upon candles 

 would be as much, if not more, than upon the gass apparatus ; so 

 tint in forming the comparison, nothing need be stated upon that 

 score, on either side. 



The economical statement for one year then stands thus : 



Cost of 1 10 tons of cannel coal . . 125 



Ditto of 40 tons of common ditto . 20 



145 



Deduct the value of 70 tons of coak . 93 



The annual expenditure in coal, after deducting the 

 value of the coak, and without allowing 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 gass apparatus about . GOO 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 sum of money above, 

 mentioned. 



If the comparison were made upon an average of thre hours 



