PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 115 
Experiments with Naphtha A. Glass 3. Temperature of the Air 17 0, 8-18°-2. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y- 
X . 
sp. H. 
O 
o 
o 
o 
grms. 
grms. 
grms. 
grm. 
51-8 
19-5 
19.24 
16-93 
26-995 
16-66 
2-04 
0-431 
0-453 
0-0359 
51-0 
19-6 
19-26 
16-95 
26-97 
55 
95 
59 
55 
0-03911 
50-0 
19-5 
19-24 
17-06 
26-965 
59 
55 
55 
59 
0-0357 
50-5 
19-6 
19-34 
17-13 
26-93 
„ 
2-03 * 
0-0359 
Excluding 
• the second experiment, which 
is obviously uncertain, these determinations 
give 0-0358 as the specific heat of iridium. This iridium was not free from metals of 
smaller atomic weight and greater specific heat. For various specimens of impure 
iridium, Regnault (Ann. de Chim. et de Phys. [2] vol. lxxiii. p. 53; [3] vol. xlvi. 
p. 263 ; vol. lxiii. p. 16) found 0-0368, 0-0363, 0-0419, and for almost pure iridium 
0-0326. 
39. Silver : pure, cast in bars. 
Experiments with Naphtha A. Glass 3. Temperature of the Air 18°-9-19°T. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• y- 
X. 
sp. H. 
o 
O 
o 
o 
grms. 
grms. 
grm. 
grm. 
52-1 
21-1 
20-82 
18-15 
26-975 
21-51 
1-585 0-431 
0-453 
0-0552 
51-5 
21-1 
20-77 
18-14 
26-99 
55 
55 55 
55 
0-0557 
51-4 
20-9 
20-62 
17-94 
26-98 
55 
55 95 
„ 
0-0574 
50-9 
21-0 
20-65 
18-06 
26-95 
55 
59 55 
„ 
0-0557 
51-0 
21-1 
20-83 
18-25 
26-965 
59 
1-565* „ 
55 
0-0558 
Copper. — Commercial copper wires f . 
I. — Experiment with Naphtha A. Glass 1. 
Mean 
Temperature 
. . . 0-0560 
of the Air 13°-2. 
T. 
T'. 
t\ 
t. 
M. 
m. 
/• y ■ 
X . 
sp. H. 
o 
0 
0 
0 
grms. 
grms. 
grm. 
grm. 
44-3 
15-9 
15-64 
12-64 
26-985 
16-505 
1-675 0-43] 
. 0-651 
0-0895 
46-2 
15-1 
14-82 
11-43 
26-97 
„ 
55 55 
„ 
0-0949 
45-7 
15-2 
14-91 
11-63 
26-97 
55 
55 55 
55 
0-0926 
47-7 
15-2 
14-93 
11-43 
26-98 
„ 
1-67* „ 
„ 
0-0930 
* After drying the stopper, 
t With reference to what has been said 
in § 24, I 
Mean 
here communicate a series 
. . . 0-0925 
of experiments (one o 
earliest) where t' was much more above the temperature of the air than usual, and hence too small numbers 
were obtained for the specific heat of the substance in question. 
Experiments with Naphtha A. Glass 2. Temperature 13 0- 8. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/. 
y> 
X. 
sp. H. 
45-6. 
16-5 
16-23 
13-02 
grms. 
26-98 
grms. 
18-33 
grm. 
1-96 
0*431 
grm. 
0*487 
0-0897 
48-5 
16-9 
16-64 
13-21 
26-97 
99 
0-0870 
43-7 
16-5 
16-15 
13-21 
26-98 
99 
1-95* 
0-0867 
* After drying the stopper. 
