314 Experiments relative to Coals and Cokes. 



chiefly of this description, and yield ashes of almost every 

 shade from light brown to deep brown red. 



The following results will show the immense variety of 

 alloy that is found in oxides taken from this class. 



= 



Q 



3 

 4 



5 

 6 



7 



8 



9 



H) 



] 1 



12 



light brown ash, - -, 



- 



2*85 



do. earthy, 



- 



4*75 



do. deeper, 



- 



5"10 



brown, 



- 



6-55 



dark do. 



- 



6; 90 



deep vivid brown, 



- 



8-50 



dull earthy do. 



- 



1075 



do. dense, 



- 



13*38 



brownish red, 



- 



14-95 



do. deeper, 



- 



17-40 



dull reddish brown, 



- 



25*80 



do. stonv, 



- 



34-66 



13 sulplmret of coal and bitumen, 48*50 



The 2d, or mixed class of coals, being in general less dis- 

 similar to each other, afford a less variety of alloy. The 

 ashes of this kind of coal are in common specifically lighter 

 than those of any other class, and vary from a blueish white 

 to a primrose colour. 



The purity of the oxides obtained from it may be gathered 

 from the following results : 

 100 parts of oxide — 



1st specimen yielded 1-25 of ashes, 

 2d 2-55 



3d 4-75 



4th 4-90 



5th 580 



6th 7-50 



7th — 1-87 



8th 2-30- 



The 3d, or hard coals, judging from appearance and from 

 the analysis of their oxides, may be divided into three va- 

 rieties ; canclle or cannel coal, hard, and stony hard. 



100 parts of the oxides of candle coal yielded of alloy as 

 follows : 



1st specimen, from Wigan, - 7*54>| 



2d Lesmihao'o, _ 9*88 1 Ashes of a 



3d Leven, - - 15-75 V pure white 



4th Glasgow Field, - 29*5,0 I colour.' 



J 



5ih uo, - - 41*75. 



Coke, 



