Proportions of Carbon in Crude Iron and Steel. T43 



grains, an exact refcmblance to mottled pie; iron. Tn this 

 experiment there remained not the moft diftant trace of car- 

 bonaceous matter. A fmall portion of amber- coloured glafs 

 was formed round the edges of the metal. Gr 



Weight of the iron 922, charcoal 46, =r - 968 



Metal refulting - - 950 



Total lofs of weight 18 



Grains. 



Exp. IX. Swedim bar iron * - 1330 



Charcoal T J T th part, or 53 grs. 

 From this mixture a perfect fufion and metallic but- 

 ton was obtained, which weighed - - 135 1 



Gained in weight by the combination of carbon 21 

 equal to -^Vd part the weight of the iron. In this experiment 

 alfo the charcoal had completely difappeared. The upper 

 furface of the button was fmooth, the under furface confider- 

 ably pitted. The concaves chequered with a rude cryftal- 

 lization peculiar to caft iron. The fracture of this metallic 

 mafs was bright filvery white, deftitute of grain, and exhi- 

 biting a very perfect (freaky crystallization tlio-htly radiated. 

 Its refemblance was ftrikingly fimilar to that or highly blown 

 call iron prepared in the finery for the purpofes of bar iron 

 making; an operation commonly in ufe for the purpofe of 

 decarbonating the iron, that it may, in the fubfequent pro- 

 cefs, fooner pafs into the (late of malleability. The weight of 

 iron and charcoal in the experiment amounted to grs. 1383 

 Iron obtained - - 1351 



Total lofs in the funon 355 



Exp. X. Swedifh iron - - 1348 



Charcoal y^tb, or 45 grs. 

 From this proportion of mixture in half an hour a 

 perfectly fufed button of metal was obtained, which 

 was found to weigh - - - 1359 



Gained in weight by the combination of carbon 11 



equal to -—d part the original weight of the iron. The 

 upper furface of this button was fmooth without configura- 

 tion. Below the furface was uneven, and covered with mi- 

 nute, but perfect cryftallization. Its fracture was blueifh (il- 

 very white, compofed of flat dazzling cryftals, proceeding in 



lines 



