ProduSfUn of Steel from Soji Iron by the D'lammct. 355; 



well luted on. Such was the whole apparatus of the experiment ; and I cannot better defcribe- 

 the refult than by giving the verbal procefs which was drawn up by Citizen Clouet, Welter, 

 and Hatchette. 



Verbal Procefs of the Experiment, made at the Polytechnic School, the 2^th Thermidoryin the 

 Year VII, on the Converfion of Iron into Steel, by the Diamond. 



The diamond employed weighed 907 milligrammes (14 grains). As it did not fill the" 

 entire capacity of the iron crucible, the remaining fpace was filled with filings of the fame iron* 

 out of which it was formed. The crucible was clofed with its iron ftopper, which- was- 

 driven in, to diminifh as much as poffible the fpace occupied by air. 



grammes. 

 The crucible and its ftopper weighed together - - 55.8 



The filings which covered the diamond - - - 2. _ 



Total weight of iron enveloping the diamond- ' - - 57.8 



, After having taken ofF the projefling part of the ftopper*, the crucible was placed aloncj- 

 and without the addition of any furrounding matter, in a Heflian crucible, and this in a fe-^- 

 cond crucible of the fame earth,, but the interval between the two crucibles was filled with a-' 

 filiceous fand, exempt from any mixture of iron. Laftly, the largeft crucible was luted with-' 

 earth, made of pounded crucibles and crude clay, and the whole was expofed about an hour 

 to the heat of the forge turnace urged by three bellows-pipes ,- 



When all was cold, the crucible of iron yvas found in the interior crucible converted 'into- 

 a button of caft-fteel. See fig. 3. Plate XVI. . It formed, together with the ftopper and 

 the filings, onefimple mafs, rounded, and well terminated, except a few globules which were 

 detached, and of which the weight was only 884 milligrammes. 



grammes. 

 The button of caft-fteel weighed - ^ 5S-5oo 



Detached globules _ . _ 0.884 



Total weight of fteel obtained 56.384, or grains. 



The iron and the diamond weighed before the operation 58.707 grammes, whence it 

 follows, that there was a lofs of iron of about 2.423 grammes. This iron Jiad given the 

 Heffian crucible the colour of plumbago. 



(Signed) CloMti Welter, and Hatchette, 



'•* This portion, as well as the remainder of the bar of which th<e crucible had been fermed, was exhibited - 

 to the clafs, to £he w the nature of the iron made ufe sf> 



The 



