142 Analysis of various Kinds of Pit- Coal, 



same shape as when introduced ; a few of the points and 

 angles were rounded, but no welding from bituminous mat- 

 ter had taken place. 



Volatile matter equal to 42*83 

 Coke hard and dense - 56*17 



100 parts. 



100 grains of the coke by combustion were found to 



contain, carbon 92*5, ashes of a pure white colour 7*5. And 



100 parts of the same coal were composed of 



Volatile matter ' k • 42*830 



Carbon - - 52*882 



Ashes - - 4-288 



too 



parts; 



Welsh Stone Coal. 





Specific gravity 1*368. 





Composed of water and hydrogen 

 Carbon 



8*0 



897 



Ashes of a grayish-brown colour 



2*3 





100 



parts. 



100 grains of coke prepared from this coal lost 10 grains 

 on being exposed for ten minutes in a heat of 178° of 

 Wedgwood. The residuum was much more, brilliant and 

 metallic-looking than formerly. 



Welsh Slaty Stone Coal. 



Specific gravity 1*409. Composed as follows i 



Volatile matter - 9*100 



Carbon - - 84*175 



Ashes whitish-gray 6*725 



100 parts. 



This coal seems to correspond, in point of quality, ap- 

 pearance and inflammability, with Cannel coal ; or, in other 

 words, it seems to bear the same relation so the stone coals 

 as Cannel coal does to the bituminous coals. I have there- 

 fore 



