368 
Cast Steel* 
grs A 
Exp* VI. Swedish iron - * « 880 
Charcoal one twelfth or - grs. 73 
This was sufficiently heated to produce fusion. 
When cold, there was found upon the surface 
of the metal a portion of very black charcoal 
weighing * 12 
Lost in the fusion, equal to 83 and a half per cent. 61 
The metallic button possessed a uniformly smooth 
surface, partially covered with carburet, and weighed 920 
Gained by the combination of charcoal, equal to one 
twenty second part - - 4Q 
Collective weight of the mixture originally intro- 
duced - grs. 953 
Charcoal not taken up * grs. 12 
Iron obtained - - 920 
— 932 
Lost in the fusion 21 
Charcoal disappeared - grs, 61 
Iron gained in weight «* 40 
Total loss in this experiment 21 
From the results of these experiments it becomes ob-, 
vious that bar iron may be converted into the finest qua- 
lities of crude iron by the addition of any portion of char- 
coal from one half to one twelfth part its weight : that in 
passing from the malleable to the carbonated crude state, 
it uniformly gains in weight by a combination of carbo- 
naceous matter equal to ^th.^-th, 4^-th, ~±-t\ 
a 1$ to 10 
“rrd : average -Lg. th part its own weight 
To 
It is here again worthy of remark, that in all these ex- 
periments with open vessels, a portion of charcoal disap, 
peared always in proportion to the quantity introduced, 
■and not analogous to the quantity of iron. 
