Caji Steel from Bar Iron. ICrj 



very thin fplLnters, however, difplayed a rich amber-green 

 colour. 



2d, 1000 grains of Kilkenny marble and 500 grains of 

 cold fliort iron were fufcd, with a lofs of -j-\jth of'nictar. The:" 

 glafs was ■)( a deep grafs-grecn colour. V.. . ^ 



3d, Lqual mixtures ot 1 -3d each of Italian marble and 

 clay pot tuicd with 1000 grains cold fliort iron, a lots of 



ih part was fuftaincd. 



4th, 2000 grains of Italian marble and 1000 grains of 

 cold fliort iron were fufcd together : a very black, finooth,. 

 Alining glafs was obtained, and a lois of i-9th of,|r6iX!Vva$ 

 experienced. 



^tii, I welded fevcral pieces of this cold fl)ort iron ; drew 

 it into a bur; cut the bar acrofs ; welded the pieces, and 

 a^ain drew it into fliaj^e. The iron feenied coufidcrably 

 improved. 1000 grains of this iron were fufed wiih 666 

 grains of an equal mixture of Italian marble and Stqurbridge 



clay pot : the lofs in metal only amonnted to — - part of 



the original weight of the iron. 



The foregoing experiments arc, I conceive, in point of 

 variety and accuracy, fufficient to demonftrate, that in no 

 proportion, either alone or in mixture, does carbonate of 

 lime, by the decompofition of its acid, or othcrwife, com- 

 municate carbonaceous matter to iron fufed in contad. with 

 it. In fceking, therefore, for an explanation of the pheno- 

 mena which have fo completely deceived the Parifian chc- 

 mids, the two followinjr rcafons occur as being moil proba- 

 ble. The crucibles uled may have contained a portion of 

 carbonaceous matter, or the reporters have been deceived by 

 the ignorance or intention of their artifts. If the latter has 

 been the cafe, then the concluding paragraph of my com- 

 nnmication in Jaiuiary will apply witti peculiar force: if the 

 former, the following experiments will fhow liow ealily the 

 deception might have taken place. 



lit Experiment with blapk lead crucibles. Grains. 



Swedifli iron - - - ^95^ 



Calcined carbonate of lime 17.50 grains, 

 Stourbridge clav pot - 1750 grains. 

 This mixture was expofed lo a degree of heat capable 

 of fufmg a fm.ill portion of caft Ik'cl, and in an hour 

 I found the contcnis completely reduced. When the 

 crucible was withdrawn, and cooled, I found an ingfjt 

 ol metal ; the upper fuifacc of which v/as beautifullv 



G 4 ( olourrd. 



