378 
Cast Steel , 
Iron semi-steelified is made with, charcoal, 777th part. 
Soft cast steel, capable of welding, with, 777th 
Cast steel, for common purposes, with, ~~th 
Cast steel requiring more hardness, with, of 
charcoal, - - ~th part. 
Steel capable of standing a few blows, but quite 
unfit for drawing, - - ~th 
First approach to a steely granulated fracture, is 
kh to ?ith 
T?th 
T?th 
T 7 th 
ri*, or 
from 
White cast iron 
Mottled cast iron 
Carbonated cast iron 
And supercarbonated crude iron 
when any greater quantity is used. 
Although this is the quantity of charcoal necessary to 
form these various qualities of metal by this mode of syn- 
thesis, yet we are by no means authorized to conclude that 
this is the proportion of real carbonaceous matter taken up 
by the iron, seeing that in experiments No. I. to No. VI. 
inclusive, the weight gained by the iron was upon the ave- 
rage equal only to 7787th, part ; whereas the charcoal 
£ 1 — 
. 1 ° 
which disappeared m the different fusions amounted to 
61. 1 per cent, of the original quantity introduced along 
with the iron. 
In the succeeding experiments the following differen- 
ces are remarkable : 
No. VII. 
Charcoal 
used. T qth 
- Iron 
gained 
-j-J-th part. 
No. VIII. 
- 
- 
- 
No. IX. 
- 
*** 
- 
No. X. 
- 
TG-th 
- 
- 
1 1 
122 2" 
No. XI. 
- 
- 
No. XII. 
- - 
§ O'th 
- Iron 
lost 
TF^th 
No. XIII. 
- 
srjth 
(tS- 
- 
1 6 th 
•3S TO 111 
No. XIV. 
r* 
TGlyth 
- 
1 8 * 
. 72 10 L ‘~ 
