376 Prof. Eggeriz on determining combined Carbon. 
would represent one centigram of carbon, and consequently 
one cubic centimeter of the normal solution would represen 
‘0001 gram of carbon. 
The normal solution does not keep, and should be often re- 
this solution keeps much longer without sensible change. 
one gram of iron cannot readily be dissolved in less than 
79 I ; 
by means of the normal liquid, but this minimum is seldom 
found in practice, 
If the proportion of carbon exceeds 3. of one per cent, the 
0 
is prepared by diluting the normal liquid with twice its volume 
of water; then each cubic centimeter of the liquid represents 
only one-third of the ten thousandth part of a gram of carbon. 
When the proportion of carbon in the specimen to be analyzed 
1s very large (as for instance in white cast iron) only ‘05 gram 
_. of the metal must be taken for analysis, and in that case half 
a cubic centimeter of its solution corresponds to a cubic centi- 
meter of the normal solution, If the metal to be analyz 
contains graphite, the latter must be collected ona filter before 
the solution is put into the burette. 
This method is more exact in proportion as the percentage 
of carbon is smaller. With an accurate balance, and with suit- 
able arrangements, a great number of determinations of carbon 
close aga for practice can be effected in a time relatively 
short. 
__All the Bessemer steel made at Edskin in Sweden is marked 
after | mmering (apres V’ éirage) by figures expressing its hard- 
ascertained by this color-measuring analysis of ee 
ious that only burettes of perfectly colorless glass 
used, or at least they must all have exactly the same 
+ 
i. 
en irons contain 
8, Penn., has found it quite practicable 
ish between i respec 
| ee eae eae ee ee eae eae am 
