535 



III. COAL ON THE TYRONE BASIN. 



Of this locality two kinds of coal were examined, from 

 opposite sides of the field, the new Dvumglass Colliery, and 

 the colliery at Coal Island. 



COAL ISLAND COAL. 



It is slaty in structure, dull coloured ; sp. gr. 1 .267. 

 On ignition it gives off much gas, froths, and leaves a very 

 porous coke. 



2.814 gave 0.328 of ashes almost white. 

 8.830 grammes gave after ignition 5.390 of coke. 

 It hence consisted of 



Volatile matter 38.96 



Pure coke 49.39 



Ashes 11.66 



100.00 



lu its elementary analysis, 0.563 gramme gave : 



Water 0.297 



Carbonic acid 1.426 



Whence results the composition 



Carbon 69.08 



Hydrogen 5.86 



Oxygen 13.41 



Ashes 11.65 



100.00 



On ignition with lithai-ge, one part of this coal gave 26^ 

 of lead, hence 100 parts correspond to 78 of pure carbon. 



NEW DRUMGLASS COLLIERY. 



This coal is brilliant, black, friable, frequently mixed 

 with pyrites, which oxidize on exposure to the air.. Its 

 ashes are consequently reddish. On ignition it gives off 

 much gas, froths, and produces a light porous coke. Its 

 practical analysis was as follows : 



