PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
123 
Experiments with Naphtha A. Glass 3. Temperature of the Air 17 0- 2. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• y- 
X. 
sp. H. 
0 
O 
o 
o 
grms. 
grms. 
grms. 
grm. 
51-9 
19-4 
19-13 
16-02 
26-985 
3-59 
2-29 0-431 
0-453 
0-318 
52-2 
19-5 
19-23 
16-12 
26-99 
55 
5> ?) 
55 
0-314 
48-2 
19-3 
19-04 
16-32 
26-95 
55 
y> 
55 
0-305 
49*2 
19*6 
19-32 
16-53 
26-985 
55 
2-27* „ 
Mean 
55 
0-310 
0-312 
45. Spinelle, Mg Al 2 0 4 f . Transparent crystalline grains from Ceylon of octahedral form. 
I. — Experiments with 
Naphtha A. < 
Glass 1. 
Temperature 
of the Air ll°-5. 
T. 
T'. 
t'. 
t. 
M. 
in. 
/• 
y • 
X. 
sp. H. 
o 
0 
0 
o 
grms. 
grms. 
grm. 
grm. 
45-6 
13-8 
13-52 
10-88 
26-925 
5-025 
1-325 
0-431 
0-651 
0-202 
44-1 
13-5 
13-23 
10-68 
26-965 
55 
55 
55 
55 • 
0-204 
46-0 
13-8 
13-46 
10-84 
26-96 
55 
55 
55 
55 
0-193 
44-8 
13-9 
13-55 
11-04 
26-975 
55 
1-32* 
55 
55 
0-193 
Mean 
0-198 
II. — Experiments with Naphtha A. 
Glass 2. 
Temperature 
of the Air ll°-5, 
T. 
T'. 
t'. 
t. 
H. 
m. 
/• 
y- 
X. 
sp. H. 
O 
0 
o 
o 
grms. 
grms. 
grm. 
grm. 
45-7 
14-1 
13-83 
11-47 
26-935 
5-025 
1-265 
0-431 
0-487 
0-195 
46-1 
13-8 
13-54 
11-14 
26-95 
„ 
55 
55 
55 
0-193 
46-2 
13-2 
12-85 
10-33 
26-975 
55 
55 
55 
„ 
0-205 
48-0 
13-8 
13-45 
10-93 
26-95 
„ 
1-26* 
55 
55 
0-190 
Mean . . . 0T96 
I subsequently received another quantity of spinelle grains, also from Ceylon, and 
have made the following series of experiments with this material. 
III. — Experiments with Naphtha A. Glass 1. Temperature of the Air 15°-5. 
T. 
T'. 
t'. 
t. 
M. 
in. 
/• 
y- 
X. 
sp. H. 
o 
o 
o 
0 
grms. 
grms. 
grm. 
grm. 
46-6 
17-7 
17-36 
14-53 
26-94 
7-53 
1-34 
0-431 
0-651 
0-187 
47-5 
17-8 
17-46 
14-53 
26-96 
„ 
55 
55 
55 
0-190 
47-6 
17-8 
17-54 
14-63 
26-965 
55 
55 
„ 
55 
0-187 
48-4 
17-8 
17-54 
14-54 
26-95 
55 
1-32* 
55 
55 
0-189 
Mean . . . 0188 
* After drying the stopper. 
t Abich’s analysis of red spinelle from Ceylon (Rammeesberg’s ‘ Handbuch der Mineralchemie,’ p. 161), 
gave the following results compared with those calculated by the above formula : — 
A1„0 3 . Cr 2 0 3 . MgO. FeO. Si0 2 . Total. 
Analysis 69-01 1-10 26-21 0-71 2-02 99-05 
Calculation 71-99 „ 28-01 „ „ 100-00 
