PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
105 
II. — Experiments with Water. Glass 2. Temperature of the Air 13°*2. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• y- 
X. 
sp. H. 
O 
O 
0 
0 
grins. 
grms. 
grms. 
grin. 
45*8 
16*4 
16*07 
12*36 
26*96 
4*815 
2*09 1*000 
0*487 
0*171 
47*3 
16*6 
16*33 
12*46 
26*95 
33 
55 5? 
33 
0*170 
44*1 
16*5 
16*15 
12*74 
26*925 
33 
99 55 
33 
0*156 
45*1 
16*6 
16*28 
12*77 
26*96 
33 
2*07* „ 
Mean 
33 
0*159 
0*164 
Both these series of determinations are from the time when I first worked at this 
subject. Towards the end, when I had acquired tolerable readiness, I made a third 
series, which agreed very closely with the results previously obtained. 
III. — 
-Experiments with Water. Glass 3. 
Temperature of the Air 17°*2. 
T. 
T. 
o 
t'. 
0 
t. 
o 
M. 
grms. 
m. 
grms. 
/• 
grms. 
y- 
CC. 
grm. 
sp. H. 
43*7 
19*1 
18*83 
15*79 
26*99 
4*92 
2*065 
1*000 
0*453 
0*166 
43*5 
19*1 
18*84 
15*84 
26*97 
33 
33 
33 
33 
0*162 
43*3 
19*2 
18*92 
15*92 
26*94 
33 
33 
33 
0*170 
43*1 
19*2 
18*87 
15*93 
26*98 
33 
2*05 * 
33 
Mean 
33 
0*166 
0*166 
Taking the mean of the means obtained in the three series of experiments, 0T59, 
0T64, 0T66, we obtain 0T63 as the specific heat of rhombic sulphur between 17° and 
45°. By the method of cooling, Dulong and Petit found the specific heat of sulphur 
at the mean temperature to be 0T88 ; Neumann found 0*209 by the method of 
mixture; for sulphur which had been purified by distillation, fused and cast in rolls, 
Begnault found f the specific heat between 14° and 98° to be 0*2026. In these expe- 
riments a development of heat depending on a change from amorphous sulphur into 
rhombic-crystallized appears to have cooperated, and to have caused the circumstance 
observed by Begnault, that after immersing the heated sulphur in the water of the 
calorimeter, the maximum temperature was only set up after an unusually long time. 
Sulphur which has solidified after being melted, usually contains an admixture of 
amorphous sulphur, the greater the more the melting-point has been exceeded, which at 
the ordinary temperature passes slowly, at 100° more rapidly, into crystallized, accom- 
panied by disengagement of heat. The transformation of the sulphur set up by the 
heating, and continued in the water of the calorimeter, brought about this slow appear- 
ance of the maximum temperature, and made the specific heat appear too great ; for 
Begnault’s subsequent determinations J, also made between 97° and 99° and the mean 
temperature, gave it considerably less: 0*1844 for freshly melted sulphur (in which 
* After drying the stopper. 
t Ann. de China. et de Phys. [2] vol. lxxiii. p. 50. Ibid. [3] vol. ix. pp. 326 & 344. 
Q 2 
