FUEL. 



119 



Sixty bushels Pictou or Virginia Coal, will made 75 bushels 

 coke of an inferior quality compared with the above. 



A bushel of the best coke weighs 32 Ibs. 



The production of coke by weight is about |- that of coal. 



Coal furnishes 60 to TO per cent, of coke by weight. 



1 Ib. of coke will evaporate in a common locomotive boiler 

 74 Ibs. of water at 212 into steam. 



o 



TABLE, showing the weights, evaporative powers per weight, 

 ~bulk and character of Fml. 



Prof. W R Johnson. 



