FUEL. 



115 



Coal Mining in Pennsylvania. 



TABLE, showing the weights per cubic foot of the different 

 kinds of Coal. 



Designation. Weight in Ibs. 



Anthracite, 50 to 55 



Bituminous 45 to 55 



Cumberland, 53 



Designation. Weight in Ibs. 



Western, (bitum.) 47 



English, " 50 



Charcoal, (hard wood) 18 



do. (soft or pine wood). . . 18 



Virginia, (bitum.) 49 



NOTE. Soft coals are usually purchased at the rate of 

 28 bushels of 5 pecks each, to a ton of 43.56 cubic feet. 

 Anthracite, 20 bushels to the ton 



To prepare charcoal. 



Charcoal is prepared by clearing off the top soil from a 

 circular space of the required dimensions, and piling bil- 



