266 Mr. J, Napier on Copper Smelting 



Prom another pit of similar quality of coal : — 

 Coke . . 85*4 ^-rxr. 

 Volatilized 14-6 ... \ c^\ 



1000 



ater 

 ilpliur 



1-8 

 •4 



2^ 



leaving 12'4 per cent, of carbonaceous volatile matters. 

 Ash 2"6 per cent., gave — 



Silica . . . . 1'5 

 Oxide of iron . . '7 

 Lime .... '4 



¥6 

 Coke increased in bulk three times. 



Weak coal. — Not strong enough to smelt alone, but used for 

 mixing with strong coal, or for calcining, and other operations 

 requiring less heat. 



Coke . . 66 

 Volatilized 34 



/Water 

 \_ Sulphur 



2-5 

 •9 



100 



leaving 30" 6 carbonaceous volatile matters, 

 bulk four times, very light and spongy. 

 Ash 2"8 per cent., gave — 



Silica . . . . 1'3 



Oxide of iron . . '7 



Lime .... "4 



Magnesia ... '2 



Loss .... "2 



2^ 



/Water 

 \ Sulphur 



3-4 

 Coke increased in 



From another pit : — 



Coke . . 

 Volatilized 



86-7 

 13-3 



1000 



2-5 

 •6 



31 



Coke increased 1^ 



leaving 10*2 carbonaceous volatile matters 

 time in bulk in caking. 

 Ash 4' 7 per cent., gave — 



Silica .... 2-2 



Oxide of iron . . 1*4 



Lime .... "6 



Magnesia ... '2 



Loss .... "3 



¥7 

 These few analyses, from a great many, give the general cha- 



