PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. Ill 
II. — Experiments with Naphtha A. Glass 1. Temperature of the Air 19°-0-18°*7. 
T. 
T'. 
t\ 
t. 
M. 
m. 
/• 
y- 
X. 
sp. H. 
0 
o 
grms. 
grms. 
gnu. 
grm. 
53-9 
21-1 
20-77 
18-22 
26-97 
3-515 
1-935 
0-431 
0-651 
0-174 
52-2 
21-0 
20-73 
18-31 
26-96 
55 
55 
» 
„ 
0-176 
52*1 
21*2 
20-86 
18-52 
26-94 
„ 
0-158 
53-0 
21-0 
20-73 
18-32 
26-97 
„ 
55 
„ 
„ 
0-155 
52-8 
21-0 
20-73 
18-33 
26-965 
55 
1-91* 
„ 
„ 
0-160 
Mean 
0-165 
III. — Experiments with Naphtha 
A. Glass 3. Temperature of 
1 the Air 
■ 19°-9-20°-0. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/- 
y- 
X . 
sp. H. 
0 
o 
o 
o 
grms. 
grms. 
grms. 
grm. 
51-6 
21*9 
21-55 
19-33 
26-97 
3-90 
2-05 
0-431 
0-453 
0-174 
51-3 
22-0 
21-71 
19-52 
26-955 
55 
55 
0-174 
51-5 
22-0 
21-70 
19-52 
26‘97 
55 
55 
0-168 
51-5 
21-9 
21-63 
19-42 
26-96 
5J 
2-04* 
55 
55 
0-175 
Mean . . . 0T73 
The average of the means of these three series of determinations, 0T83, 0T65, and 
0T73, gives 0T74 as the specific heat of Ceylon graphite between 21° and 52°. 
Iron graphite from Oberhammer, near Sayn, separated upon black ordnance iron. 
Thin, very lustrous laminae, freed from iron by treatment with aqua regia as much as 
possible, yet not completely f. 
* After drying the stopper. 
t This iron graphite, according to Mr. Huber’s analyses, in which it was also burned in oxygen in a plati= 
i num boat placed in a porcelain tube, gave the following results : — • 
I. 
II. 
III. 
Carbon 
. . 97-01 
96-12 
96-37 
Hydrogen . . 
0-12 
0-18 
Ash 
. . 4-88 
C» 
3-99 
101-89 
101-11 
100-54 
It is probable that both in this graphite and in that of natural occurrence, the hydrogen is not essential, but 
arises from hygroscopic moisture. The residual ash contained porous particles consisting of sesquioxide of iron 
and silica, and also small pellets, covered externally with a layer of magnetic oxide of iron : these dissolved in 
hydrochloric acid at first quietly, and afterwards under disengagement of hydrogen ; and in the solution small 
blisters of graphite could he perceived. It is owing to the oxidation of the iron that the sum of the constituents 
in all cases exceeds 100. 
R 
MDCCCLXV. 
