118 
PKOFESSOE KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
Iron : pieces of iron wire. 
I. — Experiments with Naphtha A. Glass 2. Temperature of the Air 13 0- 2. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y- 
SC. 
sp. H. 
0 
o 
o 
o 
grms. 
grms. 
grm. 
grm. 
46-6 
16-2 
15-92 
12-52 
26-97 
17-565 
1-46 
0-431 
0-487 
0-108 
45-4 
15T 
14-83 
11-33 
26-95 
55 
„ 
,, 
55 
0-114 
46-0 
15-1 
14-77 
11-22 
26-935 
55 
„ 
55 
55 
0-113 
46-2 
15-2 
14-91 
11-34 
26-98 
55 
1-455 
* 
55 
„ 
0-113 
Mean 
0-112 
II. — Experiments with Water. 
Glass 
1. Temperature of the 
Air 16°- 
o" 
r- 
i— i 
1 
oo 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y • 
sc. 
sp. H. 
O 
0 
a 
o 
grms. 
grms. 
grm. 
grm. 
43-2 
18-8 
18-46 
15-02 
26-985 
15-57 
1-425 
1-000 
0-651 
0-111 
42-9 
19*1 
18-84 
15-47 
26-975 
55 
55 
,, 
„ 
0-112 
43-6 
19*3 
19-04 
15-62 
26-99 
55 
55 
„ 
0-111 
42-5 
19*3 
19-01 
15-72 
26-985 
55 
1-42* 
55 
55 
0-113 
Mean . 
. . 
0-112 
The means of both series of experiments give for the specific heat of iron between 
17° and 44° the number 0T12. 
With reference to what has been said in § 24, the following series of experiments 
made at the beginning of my investigation are given, in which t' exceeded the ordinary 
temperature much more than usual, and hence the numbers for the specific heat of iron 
were found somewhat too small. 
Experiments with Naphtha A. Glass 1. Temperature of the Air 13°-8. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y- 
sc. 
sp. H. 
o 
O 
0 
o 
grms. 
grms. 
grm. 
grm. 
48-1 
16-4 
16-12 
12-73 
26-93 
15-57 
1-185 
0-431 
0-651 
0-111 
44-5 
16-3 
15-97 
13-03 
26-905 
,, 
„ 
„ 
„ 
0-106 
45-7 
16-6 
16-26 
13-23 
26-97 
55 
55 
„ 
55 
0-106 
47-0 
16-7 
16-43 
13-23 
26-96 
55 
1-17* 
55 
55 
0-103 
Another 
source 
of error 
which 
may make the numbers 
for the specific heat < 
substance investigated too small, has been discussed in § 18 and 24, — the circumstance, 
namely, that the substance may fill the glass so densely as to impede the circulation of 
the liquid, or make it impossible. This circumstance made the numbers for the 
specific heat of chromium , which were obtained from the following series of observa- 
tions, too small. The chromium was reduced from chloride of chromium according to 
Wohler’s method by means of zinc (Ann. der Chem. und Pharm. vol.'cxi. p. 230); 
the heavy, finely crystalline powder deposits in the glass as a dense mass impeding the 
circulation. The following results were obtained : — 
* After drying the stopper. 
