On Cast Iron and Steel. 299 



Ing charcoal with the manganese, I attempted to fuse 

 400 grains of the same baling dust with 40 grains of char- 

 coal. The result was imperfect, owing to the iron and char- 

 coal forming a carburet, which was infusible in the highest 

 heat of the furnace. With 15 grains charcoal and the same 

 quantity of boring dust, a fine button of carbonated smooth- 

 faced iron was obtained, weighing 391 grains ; loss 9 grains, 

 or 2y per cent. ; fracture blackish gray. 



9. Boring dust .. .. •• .. .. 400 grs. 



Manganese oxide . . . . . . . . 100 



Charcoal . . . . , . . . , , 40 



This fusion afforded a dense button of mottled cast iron, 

 weighing 393 grains; loss 7 grains, or 1| per cent.; there 

 remained unreduced 10 grains of magnetic black carburet 

 of iron. In this experiment 2 grains extra of metal arc 

 obtained from the manganese, and a decarbonation expe- 

 rienced from very gray to mottled cast iron, 



10. Boring dust 400 



Manganese oxide . . . , . . . . 200 



Charcoal . . , . . . . . • • 40 



This fusion afforded a dense button of white cast iron, 

 the fracture of which indicated a greater portion of metallic 

 manganese in alloy than had hitherto been obtained in 

 these experiments ; weight 401 gravns. In the fusion of 

 400 grains of boring dust with ]i> grains of charcoal, 391 

 grains of iron was obtained: in the present experiment the 

 result was 401 grains; which is an increase of 10 grains of 

 metal derived from 200 grains of manganese in consequence 

 of mixing with it 40 grains of charcoal. This present me- 

 tallic button may therefore be considered as being com- 

 posed Of iron 97-5 



Manganese . , . . , . 2*5 



100 pts. 

 In this experiment the metallic button was found covered 

 with a party-coloured glass, milky blue, brown, and gar- 

 net ; 3 grains of magnetic carburet of iron found unreduced. 



11. Boring dust 400grs. 



Manganese oxide , . . . . . . . 400 



Charcoal . . . . . . . . . . 40 



The result of this fusion was a fine crystallized metallic 

 button weighing 390 grains; loss 10 grains, or 2| percent, 

 the effect of the charcoal as to metallizing the manganese 

 seems to have attained its maximum in No. 10. The glass 

 now obtained was brownish red, without any carburet on 

 its surface, as in Nos. 9 and 10, 



These 



