265 



Mr. J. Napier on Copper Smelting. 



Strong coal. — Too strong to use alone for smelting, and requi- 

 ring to be mixed with weaker coal from two different pits. 



No. 1. 

 Coke . . 77-8 ^Q , , _ 



Volatilized 22-2 ... \ ^j^ip'^u'' '8 per cent. 



100-0 



••• \"V\' 



aier 



1-9 

 2^ 



leaving 19-5 of carbonaceous volatile matters. Coke increased in 

 bulk three times in caking. 



Ash 3'1 per cent., which gave — 



Silica . 



Oxide of iron 



Lime 



Magnesia . 



Loss . . 



Coke . , 

 Volatilized 



No. 2. 



•4 



20 



•3 



•2 



j2 



31 



81 

 19 



100 



{Sulphur 

 Water . 



leaving 16-2 of carbonaceous volatile matters, 

 creased in bulk 3i times. 



Ash 7-2 per cent., very red in colour, gave — 



1-8 

 10 



2^ 



The coke in- 



Silica 

 Oxide of iron 

 Lime 



Magnesia . 

 Loss 



2-0 

 3-5 

 1-2 



•4 

 •1 



7-2 



Strong coal. — Strong enough alone for smelting, but does not 



stand mixture with inferior qualities to w^ork well or 03cono- 



mically. 



Coke . . 86 .-,,., , . 



Volatilized 14 ... \ f f ^f • ^t 

 1 Sulphur "o 



100 



leaving 12*1 volatile carbonaceous matters. 

 bulk three times in caking. 



Ash 2-8 per cent., of a light red colour, gave 

 Silica .... "5 

 Oxide of iron . . 1-8 

 Lime .... '4 

 Magnesia . . . trace 

 27 



1-9 



Coke increased in 



