On the Application of the Gasfro?n Coal. 113 



quality and quantity of the gas produced from that material 

 having given it a decided preference in this situation, over 

 every other coal, notwithstanding its higher price. 



The time during which the gas light is used, may, upon 

 an average of the whole year, be stated at least at two hours 

 per day of twenty- four hours. In some mills, where thei% 

 is over work, it will be three hours ; and in the few where 

 night-work is still continued, nearly, twelve hours. But 

 taking two hours per day as the common average throughout 

 the year, the consumption in Messrs. Philip's' and Lee's 

 mill will be 1250 x 2 = 2500 cubic feet of gas per day ; 

 to produce which, seven hundred weight of cannel coal is 

 required in the retort. The price of the best Wigari cannel 

 (the sort used) is ]3{d. per cwt. (225. 6d. per ton), deli- 

 vered at the mill, or say about eight shillings for the seven 

 hundred weight. Multiplying by the number of working 

 days in the year (313), the annual consumption of cannel 

 will be 110 tons, and its cost 125^. 



About one-third of the above quantity, or say forty tons 

 of good common coal, value ten shillings per ton, is re- 

 quired for fuel to heat the retorts; the annual amount of 

 which is 20/. 



The 1 10 tons of cannel coal, when distilled, produce about 

 70 tons of good coak, which is sold upon the spot at 15. 4d. 

 per cwt. and will therefore amount annually to the sum 

 of 93/. 



The quantity of tar produced from each ton of cannel coal 

 is from eleven to twelve ale gallons, making a. total annual 

 produce of about 1250 ale gallons, which not having been 

 yet sold, I cannot determine its value ; but whenever it 

 comes to be manufactured in large quantities, it cannot be 

 such as materially to influence the ceconomical statement, 

 unless indeed new applications of it should be discovered. 



The quantity of aqueous fluid which came over in the 

 course of the observations which I am now giving an ac- 

 count of, was not exactly ascertained, from some springs 

 having got into the reservoir ; and as it has not been yet ap- 

 plied to any useful purpose, I may omit further notice of it 

 in this statement. 



H2 The 



