THE 



PHILOSOPHICAL MAGAZINE. 



I. On the different Proportions of Carbon which conjlitute the 

 various Qualities of Crude Iron and Steel; being a Con- 

 tinuation of the Experiments on the fame Subjecl detailed 

 in our lafl Number. By David Mushet, Efq. of the 

 Calder Iron Works ** 



H 



AVING felected a parcel of well -prepared Stourbridge 

 clay crucibles, with covers exactly fitting, I proceeded to 

 make the following experiments upon the quantity of char- 

 coal which forms crude iron and fteel ; firft premifing that 

 both crucible and cover were brought to a bright red heat 

 before the fubftances acted upon were introduced. This was 

 done with the greateft poffible caution, to avoid volatilizing 

 any part of the charcoal, and rendering the refult inaccurate. 

 From the approximation of thefe refults in repeating moft of 

 thefe experiments, I found that no material difference had 



occurred. Grains. 



Exp. I. Swedifh bar iron - - 88j 



Charcoal », or - - grs. 443 



This mixture was expofed for half an hour, and 

 a perfect button of fupercarbonated crude iron 

 was obtained. Along with the metal was found 

 of intenfely black charcoal not taken up - 290 



Charcoal difappeared, equal to 34*4 per cent. 152 

 The metallic button now obtained was found to weigh 928 



Gained in weight by the combination, equal to — f 



part of the original weight of the iron 43 



Charcoal difappeared - - 152 



Total lofs in charcoal 109 



* Communicated by the Author. 



A 2, Collective 



