92 APPLICATION OF THE GAS PROM COAL. 



description abovementioned ; and each of the latter, a llglit 



equal to two and a quarter of the same candles ; making 



giving light therefore the total of the gas light a little more than equal 



«^"''' '" '^ifi to that of 2500 caudles. AVhen thus regulated, the whole 



mould candles o 



of 6 to the lb. of the above burners require an hourly supply of 1250 cu- 

 consvinie 12j j-^j^ ^^^^ ^i^ ^.j^^^ .^g produced from cannel coal; the superior 



cub. feet of <;i>s . ^ . . 



fiotii camitl quality and quantity of the gas produced from that material 

 coal hourly. having given it a decided preference in this situation, over 

 every other coal, nocvvithstanding 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 there 

 . is over work, it will be three hours ; and in the few whei*e 

 night work is still continued, nearly twelve hours. But 

 taking two hours per day as the common average through- 

 out the year, the consumption in Messrs. Philips and Lee's 

 This requires mill, will be 1250 X 2 =: 2506 cubic feet of gas per day; to 

 C^cwt. oi can- produce which, seven hundred weight of cannel coal is re- 

 retorts quired in the retort. The price of the best Wigan cannel 

 (the sort used) is \3\d. per cwt, [9.2s. Qd. 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. 

 lb 1 3d ^bout one third of the above quantity, or say forty ISMis of 

 as much good good coiTfimon coal, value ten shillings per ton, is required 

 oonunon coal f^^, ^^^^^ ^^ ^^^^ ^j^^ vetorts ; the annual amount of which i» 



to Ueat them. 



£20. 



„ . . The 110 tons of cannel coal, when distilled, produce about 



Produce ui . / ' ^ 



coak. 70 tons of good coak, which is sold upon the spot at l5. 4c?. 



per cwt. and will therefore amount annually to the sum of 



£<)3. 



_. 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 hav- 

 ing been yet sold, T cannot determine its value; but when- 

 ever it conies to be manufactured in large quantities, it 

 . cannot be such as materially to influence the economical 



l^g statement, unless indeed new applications of it should b© 



<lisc»vered. 



The 



