PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 103 
II. — Experiments with Glass 3. Temperature of the Air 18°T-18°-3. 
T. 
T'. 
t\ 
t. 
M. 
/. 
X. 
sp. H. 
51-4 
19-7 
19-36 
17-32 
grins. 
26-94 
grms. 
3-085 
grm. 
0-453 
0-415 
51-5 
19 9 
19-63 
17-56 
26-965 
55 
0-426 
49-1 
19-9 
19-61 
17-73 
26-955 
55 
« 
0-416 
50-5 
20-1 
19-82 
17-86 
. 26-98 
3*08 * 
0-418 
Mean 
• - - 
0-419 
III.- 
—Experiments with 
Glass 1. 
Temperature of the Air 17°-8-18°-3. 
T. 
T'. 
t'. 
t. 
M. 
/• 
X. 
sp. H. 
52-2 
19-8 
19-49 
17-27 
grms. 
26-97 
grms. 
2-80 
grm. 
0-651 
0-427 
50-6 
20-0 
19-73 
17-64 
26-96 
59 
„ 
0-425 
51-2 
20-2 
19-92 
17 82 
26-98 
55 
0-420 
51-3 
20-2 
19-86 
17-76 
26-99 
95 
?? 
0-418 
50-4 
20-2 
19-86 
17-85 
26-95 
2-785 * 
55 
0-410 
Mean 
0-420 
IV. — Experiments with Glass 3. Temperature of the Air 18° 
■4. . 
T. 
T'. 
t'. 
t. 
M. 
/• 
X. 
sp. H. 
50-2 
19-7 
19-43 
17-33 
grms. 
26-96 
grms. 
3-31 
grm. 
0-453 
0-424 
50-1 
20-1 
19-77 
17-66 
26-99 
55 
95 
0-416 
52-5 
20-2 
19-87 
17-65 
26-96 
55 
59 
0-423 
50-1 
20-1 
19-83 
17-82 
26-95 
55 
55 
0-409 
51-4 
20-2 
19-93 
17-82 
26-97 
3-29 * 
55 
0-417 
Mean 
0-418 
The average of the means of these four series of experiments, 0-418, 0-419, 0*420, 0-418, 
gives 0-419 for the specific heat of coal-tar naphtha B between 20° and 50°. 
In the preceding method of experiment, whether water or naphtha of the kind 
described is contained in the vessel, a temperature much higher than 50° cannot be 
employed; for otherwise the quantity of liquid evaporating and condensing on the 
stopper becomes far too considerable. Perhaps with hydrocarbons of higher boiling- 
points higher temperatures might be ventured upon: I have no experiments on this 
subject. 
PART III.— DETERMINATION OF THE SPECIFIC HEAT OF INDIVIDUAL SOLID SUBSTANCES. 
31. By the method whose principle and mode of execution have been discussed in the 
preceding, I have determined the specific heat of a large number of solid substances. I 
* After drying the stopper. 
MDCCCLXV. 
Q 
