PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
109 
I. — Experiments with Naphtha A. Glass 3. Temperature of the Air 18 0, 9-18 0, 8. 
T. 
50-8 
T'. 
20-6 
t'. . 
20-33 
t. 
18-33 
M. 
grms. 
26-99 
m. 
grms. 
20-71 
/• 
grm. 
1-70 
y- 
0-431 
x. sp. H. 
grm. 
0-453 0-0291 
50-3 
20-7 
20-42 
18-43 
26-955 
99 
99 
„ 
„ 0-0302 
50-1 
20-6 
20-33 
18-37 
26-955 
99 
99 
99 
0-0292 
50-9 
20-7 
20-40 
18-42 
26-955 
99 
1-685 
* 
99 
„ 0-0284 
Mean 
. . . 0-0292 
II. — Experiments with Water. Glass 1. Temperature of the Air 16°-7-16°-8. 
T. 
45-2 
T'. 
18? 7 
t'. 
18-44 . 
t. 
15-25 
M. 
grms. 
26-97 
m. 
grms. 
19-43 
/- 
grm. 
1-995 
1-000 
x. sp. H. 
grm. 
0-651 0-0309 
45-5 
18-9 
18-57 
15-36 
26-965. 
99 
„ 
99 
,. 0-0313 
45-0 
18-9 
18-64 
15-47 
26-975 
99 
99 
99 
„ 0-0324 
46-0 
181 
18-82 
15-56 
26-99 
99 
1-985* 
99 
Mean . 
„ 0-0327 
. . 0-0318 
From these determinations we get for the specific heat of bismuth between 30° and 
48° the number 0-0305. 
36. Carbon . — It is known how different are the numbers obtained for the specific heat 
of carbon in its different forms. I have determined the specific heat for comparatively 
only a few of the modifications of carbon — for gas-carbon, for natural and artificial gra- 
phite. Before the experiment each of these substances was strongly heated for some 
time in a covered porcelain crucible, and then allowed to cool, and immediately trans- 
ferred into the glass for its reception, and, after weighing, naphtha poured over it. 
Gas-carbon from a Paris gas-works ; very dense, of an iron-grey colour, and left very 
little ash when calcinedf. It was used in pieces the size of a pea, and two series of 
experiments were made. 
* After drying the stopper. 
t This carbon, as well as the above-mentioned varieties of graphite, was analyzed in the Laboratory at 
Giessen by Mr. Hubek. The gas-carbon gave, when placed in a platinum boat and burned in a stream of 
oxygen,— 
I. 
II. 
III. 
IV. 
V. 
Carbon 
. . 97-19 
98-25 
97-73 
98-08 
98-55 
Hydrogen . '. 
. . 0-53 
0-15 
0-68 
0-37 
1-00 
Ash 
. . 0-61 
0-62 
0-73 
0-23 
0-69 
98-33 
99-02 
99-14 
98-68 
100-24 
