Determination of Carbon in Graphite. 355 
. 3. Apparatus used in the Process.—This will be understood 
from the accompanying diagram and description. 
i Pee ca 
_ A is a glass retort having a capacity’of about thirty cubic 
Inches, which we have found large enough for operating con- 
Veniently on ‘six grains of pure graphite. Its beak is bent ob- 
liquely and then vertically upwards so as to present an erect stem 
for about twelve inches, which is enclosed by a glass jar B near- 
ly filled with water. This is designed to condense any vapor of 
isa small U tube charged with fragments of potassa, having at 
each end a little flock of cotton. The latter serves to pe 
oe acid which might escape absorption in the Liebig 
ube. Th 
Preceding tubes, during the slight recoiling pulsation caused by 
the intermitting cenitis: of the Pubbles. The remote end of 
roMmMunicates with a large aspirator, through the medium of a 
leaden tube and gallows screw, as so usefully and variously ap- 
SEcony Senizs, Vol. V, No. 15.—May, 1848. 46 
a . 
