94 On the Converfion of Iron into Caf Steel 
refult than by the report drawn up by,C. Clouet, Welter, 
~ and Hachette. 
"Report = the iepetiment made at the Polytechnic School, 
_ Thermidor 25, Year 4, refpetting the Converfion of Tron - 
into Steel by the Diamond. 
“* The diamond employed weighed 907 milligrammes. As 
it did not entirely occupy they crucible, we filled it with 
filings of the fame iron as that of which it was formed. The 
crucible was fhut by its iron ftopper, which was forcibly 
thruft home, that as little air as poffible might remain in 
the infide. 
Grammes, 
«© The crucible and ftopper weighed together « 55.8 
« The iron filings which oe the diamond - 2 
** Total weight of the iron furrounding the diamoad 57.8 
«¢ After having cut off the excefs of the ftopper *, the cru 
cible was placed valde! and without the addition of any fur- 
rounding matter, in a very fmall Heffian crucible, ‘and the 
Jatter in a fecond crucible of the fame earth ; but the fpace’ 
between the two latter crucibles was filled silk filiceous fand 
free from all ferruginous particles. In the laft place, the 
large crucible was luted with earth arifing from pounded 
crucibles and unbaked clay, and the whole was expofed 
about an hour to a three-blaft-forge fire. 
‘¢ The whole being cooled, we found, in the interror Hef 
fian crucible, the iron banvamad into an ingot of caft fteel. 
(See fig. 5.) It formed, with the ftopper and filings, but 
one round mafs well terminated, fome few globules excepted, 
which were detached, and which weighed only 884 milli- 
grammes. 
Grammes. — 
“« The ingot of caft fteel weighed “ = 55.500" 
‘© The detached globules A < “ “ 0.884 
 Totat weight of the fteel obtained - = 56.384 
. 
* This portion of the flopper, as well as the remainder of the ingot of 
which the crucible was formed, were fubjeéted to the Clafs for infpeétion, 
in order to afcertain the natwre of the iron employed. b 
‘ “ The | 
