PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
133 
II. — Experiments with Naphtha A. Glass 2. Temperature of the Air 12 0, 9. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• y- 
X. 
sp. H. 
O 
o 
0 
o 
grms. 
grm. 
grms. 
grm. 
47-0 
14-5 
14-24 
11-45 
26-93 
1-88 
2-495 0-431 
0-487 
0-399 
45-0 
14-8 
14-46 
11-93 
26-98 
95 
55 55 
55 
0-371 
45-1 
14-8 
14-46 
11-93 
26-99 
” 
2-485* „ 
Mean 
55 
0-370 
0-380 
Only a small quantity of this finely crystallized chloride of ammonium goes into the 
glasses which I used for the experiments. Hence I also investigated chloride of ammo- 
nium in more compact pieces. 
Long fibrous pieces from a sublimation cake : 
III. — Experiments with Naphtha A. Glass 2. Temperature of the Air 12°T-11°'8. 
T. 
T'. 
t'. 
t. 
M. , m. 
/• y- 
X. 
sp. H. 
0 
0 
o 
o 
grms. grms. 
grms. 
grm. 
45-5 
13-9 
13*63 
10-73 
26-97 2-76 
2-20 0-431 
0-487 
0-377 
45-1 
14-2 
13-92 
11-07 
26-97 „ 
55 55 
55 
0-381 
44-2 
14-2 
13-93 
11-20 
26-98 „ 
2-19* „ 
Mean 
55 
0-371 
0-376 
From the so-called “ gas liquor,” Noellner has prepared a very pure chloride of am- 
monium, apparently in quadratic trapezoedra. With such crystals, 8 to 10 millims. 
long, I made the following determinations : — 
. — Experiments with Naphtha A. Glass 1. 
Temperature of the Air 
14°-1- 
T. 
T'. 
t. 
t. 
M. 
m. 
/• y- 
X. 
sp. H. 
o 
o 
o 
o 
grms. 
grm. 
grms. 
grm. 
48-5 
15-9 
15-63 
12-84 
26-99 
1-978 
2-085 0-431 
0-651 
0-384 
44-7 
16-0 
15-73 
13-32 
26-93 
„ 
55 55 
55 
0-360 
44-8 
16-0 
15-70 
13-32 
26-97 
59 
2-075* „ 
Mean 
” 
0-346 
0-363 
Finally, I examined chloride of ammonium which had crystallized, from a solution 
containing urea, in beautiful transparent cubes of 2 to 3 millims. in the side. 
V. — Experiments with Naphtha A. Glass 2. Temperature of the Air 14°T-13°-8. 
T. 
o 
T'. 
t'. 
o 
t. 
o 
M. 
grms. 
m. 
grms. 
/• 
grms. 
y- 
X. 
grm. 
sp. H. 
45-2 
16-0 
15-73 
13-05 
26-92 
2-595 
2-34 
0-431 
0-487 
0-376 
44-4 
16-1 
15-83 
13-25 
26-975 
55 
55 
95 
55 
0-371 
45-7 
16-4 
16-08 
13-45 
26-96 
55 
2-33* „ 
Mean 
55 
0-358 
0-368 
The mean of the means of the five series of determinations, 0-377, 0-380, 0-376, 0-363, 
0-368, gives 0-373 for the specific heat of chloride of ammonium between 15° and 45°. 
* After drying the stopper. 
