Cast Steel* 
§75 
■ ■ ,, . 
coal, too minute for weighing. 
The metallic button weighed - - 1213 
Gained in weight by the combination of charcoal 39 
equal to ~th part the weight of the iron. 
Weight of the iron 1174, and charcoal 78,= 1252 
Weight of the button - - - - 1213 
Total loss of weight in the fusion 39 
equal to that gained by the iron. Upon mintite inspec- 
tion, no part of the surface of this button was carbonated. 
The colour was blueish black, smooth in the centre but a 
little oxidated towards the edges. Its fracture presented 
close dark grey crude iron. The crystals much closer and 
more minute than in those experiments where richly 
carbonated crude iron was obtained. Appreciating its 
real quality by comparison with crude iron manufactured 
for sale, it occupied that rank generally known by the 
names of No. II. grey melting pig iron. 
j E xp. VIII. Swedish bar iron - - grs. 922 
Charcoal ~- 0 th part, or 46 grs. 
From the exposure of this mixture there resulted a 
very perfect metallic button whose upper surface 
presented a partial degree of radiated crystallization. 
It was found to weigh - - - 950 
Gained in weight by the combination of carbon 28 
equal to ~-d part the original weight of the iron. The 
fracture of this button was smooth, silvery white, occa- 
sionally studded with carbonaceous specks in the form of 
small grains, an exact resemblance to mottled pig iron. 
In this experiment there remained not the most distant 
trace of carbonaceous matter. A small portion of amber- 
coloured glass was formed round the edges of the metal. 
