366 On Primary Ores of Iron. 



In order to de-oxygenate this ore, I introduced, mixed 

 with charcoal, into an open veffel, - 2894 grs. 



This mixture was expofed, under a high heat, 

 for ten hours : when the ore was feparated from 

 the charcoal, it weighed - - 2069 



Total lofs of volatile mixtures = 28-5 per cent. 825 grs. 



In this fhort time the whole mafs had become malleable, 

 highly polifhed, and was finely converted : when heated, 

 the pieces welded together, and were eafily drawn into 

 fmall rods of good malleable iron. 



In another experiment I expofed, of the de-oxygenated ore, 

 to a ftill higher degree of heat 1 han the former, 1 841 -5 grs. 

 The mafs, when cool, weighed - 2489 



Gained in weight, by the combination of oxygen, 647*5 g rs « 

 equal to 35'i6 of de-oxygenated ore, or 25-14 of raw ore. 



The practical analvfis of this fpecies of the Cumberland 

 ore (a mixture of kidney and haematites) may be thus 

 Hated : 



Carbonated crude iron obtained in the affay 



furnace - &V5 



Water and fulphur - 6 



Oxygen taken up - - 2 2 "5 



Earths, chiefly filex, r » 7 



100 parts. 



The fpecific oravit'ies of the various ftates of this fpecimen 

 I found to be — in a raw ftate, 4-6623 ; de-oxygenated, and 

 malleable, 6*3600 j combined with oxygen, 5-1900. 



IV* t)efcrip. 



