On alloying Iron with Manganese. 167 



than I had hitherto found practicable. I made use of the same 

 ores formerly mentioned : the fluxes were chalk and window- 

 glass ; the latter I preferred to an argillaceous earth, which, so 

 lar as it regards reduction, answers equally well, but does not 

 exhibit so transparent a glass when the results are perfect or 

 approaching thereto. 



\stExp. Iron ore .500 grs. 



Chalk 400 



Window glass . . . . . . . . 500 



Charcoal 1«0 



This mixture was perfectly reduced, though the glass indica- 

 ted by its depth of green a portion of oxide still unrevived. 

 The metallic button was smooth, its fracture and quality those 

 of the finest or most carbonated cast-iron : weight 30 grains, 

 equal to 41 \ per cent. The same experiment repeated under 

 a less rapid fusion yielded 50 per cent, of iron. When equal 

 quantities of chalk and glass were used, a carburetted metallic 

 button was obtained equal to 50| per cent. 



2d Exp. Iron ore . . 500 grs. 



Chalk 400 



Glass 500 



Charcoal .. ,. ,. ..160 



Oxide of manganese . . . . . . 100 



A perfect fusion of this mixture yielded a fine smooth carburet- 

 ted button of iron, weighing 258 grains, equal to 51-*^ per cent. 

 The glass was perfect, of a lead-blue transparency, slightly tinged 

 with the purple pecuhar to manganese. 



M Exp. Iron ore 500 grs. 



Chalk 400 



Glass 500 



Charcoal 160 



Manganese roasted .. .. .. 100 



Though in this experiment the manganese had by previous 

 masting been deprived of 20 per cent, of oxygen and moisture, 

 yet no perceptible difference took place in the result. The metal 

 and glass were similar. The weight was 260 grains, or 52 per 

 cent. The metallic results in both were magnetic. 



AlkExp. Iron-stone 500 grs. 



Roasted manganese . . . . . . 200 



Chalk 400 



Glass .. 500 



Charcoal 160 



The fusion of this mixture was very complete ; the surface a 

 perfect transparent pale glass covered wiih a coating of car- 

 buret of iron. There were besides aboul 40 grains resembling 



L. 4 the 



