ANALYSES OF AIR FROM COAL MINES. 61 



Sample from Dudley Colliery. 



(Analyses by Mr. W. M. Hamlet, p.i.c, f.c.s., Government 

 Analyst.) 



Downcast Pit. Upcast Pit. 



Carbon dioxide 3 2 per cent. Carbon dioxide 2*8 per cent. 



Atmospheric air nil Atmospheric air 15*0 ,, 



Fire-damp 968 „ Fire-damp 82-2 



100-00 100-00 



Sample from Harecastle Colliery. 

 (From Dr. Haldane's "Report on Causes of Death in Colliery 

 Explosions." 



Fire-damp 91-01 



Nitrogen 5-93 



Carbon dioxide 306 



100-00 



