124 
PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
These determinations give as the average of the means of the three series of experi- 
ments (0T98, 0T96, and 0T88) 0T94 for the specific heat of spinelle between 15° 
and 46°. 
Chrome Iron Ore , Mg ] -Fe A Or* Al, G 4 # . Fragments of granular pieces, partly dis- 
tinctly crystalline, of chrome iron ore from Baltimore. 
Experiments with Naphtha A. Glass 1. Temperature of the Air 14°‘2-13°’8. 
T. 
T'. 
n. 
t. 
M. 
m. 
/• 
y- 
cc. 
sp. H. 
O 
o 
o 
o 
grms. 
grms. 
grm. 
grm. 
47-6 
16-4 
16-12 
13-14 
26-97 
7-625 
1-63 
0-431 
0-651 
0T63 
46-9 
16-5 
16-24 
13-38 
26-985 
33 
J} 
33 
0-155 
46-8 
16-4 
16-13 
13-24 
26-925 
33 
„ 
55 
33 
0-158 
46-4 
1.6-4 
16-13 
13-28 
26-955 
„ 
1-61 f 
5J 
33 
0-159 
Mean . . . 0459 
Magnetic Iron Ore , Fe 3 0 4 . Small crystals and crystalline fragments from Pfitsch 
in Tyrol. 
I. — Experiments with 
Naphtha A. Glass 1. 
Temperature of the Air ll°-0. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y - 
X. 
sp. H. 
O 
o 
o 
o 
grms. 
grms. 
grm. 
grm. 
45-1 
13-9 
13-64 
10-54 
26-96 
9-07 
1-43 0 
1-431 
0-651 
0-156 
47-4 
13-8 
13-53 
10-23 
26-97 
33 
33 
33 
33 
0-152 
49T 
14-1 
13-84 
10-42 
26-98 
33 
33 
33 
0-151 
47-6 
14-1 
13-83 
10-54 
26-92 
33 
1-415 f 
33 
33 
0-152 
Mean . 
0-153 
II. — Experiments with 
. Water. 
Glass 
3. Temperature of the Air 19°-5-19 0, 4. 
T. 
T'. 
t'. . 
t. 
M. 
m. 
/• 
y- 
X. 
sp. H. 
O 
o 
o 
o 
grms. 
grms. 
grm. 
grm. 
43-5 : 
21-6 
21-32 : 
18-02 26-985 
10-625 
1-925 
1-000 
0-453 0-159 
42-7 
21-6 
21-32 : 
18-13 26-99 
33 
33 
33 
t 33 
0-160 
43-0 : 
21-6 
21-33 : 
18-12 26-97 
33 
1-91 f 
33 
3 3, 
0-158 
Mean 
. 0-159 
These determinations give as the mean of the averages of the two sets of experi- 
ments, 0-156 for the specific heat of magnetic iron ore between 18° and 45°. 
* The admissibility of this formula for the ore investigated follows from the following comparison of the 
results calculated from it, with those which Abich had obtained (Rammelsbebg’s £ Handbuch der Mineral- 
chemie,’ p. 172) by the analysis, a of compact, b of crystallized chrome iron ore from Baltimore. 
Cr 2 0 3 . 
Al,0 3 . 
Fe O. 
MgO. 
Total. 
Analysis 
f a 55-37 
13*97 
19-13 
10-04 
98-51 
' 1 b 60-04 
11-85 
20-13 
7-45 
99-47 
Calculation . . 
... 58-32 
13-11 
18-37 
10-20 ’ 
100-00 
f After drying the stopper. 
