144 
PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
Phosphate of Silver , Ag 3 PG 4 : yellow powder dried at 110°. This substance, in 
the quantity I used, is but ill fitted for procuring accurate results. I have made two 
series of experiments with it, but the results obtained thereby are only to be considered 
as rough approximations. 
I. — Experiments with Naphtha A. Glass 1. Temperature of the Air 20°-5-20 o, 8. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• y- 
X. 
sp. H. 
O 
0 
o 
0 
grms. 
grms. 
grms. 
grin. 
51-4 
22-5 
22-19 
20-16 
26-99 
3-775 
2-105 0-431 
0*651 
0-0895 
52-0 
22-4 
22-14 
20-12 
26-955 
33 
33 3? 
33 
0-07451 
51-5 
22-5 
22-16 
20-13 
26-965 
33 
33 33 
33 
0-0872 
51-5 
22-5 
22-15 
20-14 
26-985 
„ 
2-095* „ 
33 
0-0839 
Meanf . . . 0-0869 
II. — Experiments with Naphtha A. Glass 3. Temperature of the Air 16°-3-16°-6. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y- 
00. 
sp. H. 
o 
0 
o 
grms. 
grms. 
grms. 
grm. 
51-1 
18-4 
18-12 
15-72 
26-955 
4-545 
2-555 
0-431 
0-453 
0-0933 
51-5 
18-4 
18-13 
15-73 
26-995 
33 
53 
,, 
„ 
0-0887 
51-8 
18-5 
18-22 
15-76 
26-94 
33 
33 
33 
33 
0-0959 
51-6 
18-6 
18-33 
15-93 
26-98 
33 
2-54* 
33 
33 
0-0911 
Mean . . . 0-0923 
The mean of both these means gives 0 0896 as the specific heat of phosphate of 
silver. This number, as already remarked, is but little trustworthy. But it may be 
concluded from these experiments that the specific heat of phosphate of silver cannot 
differ much from 0-09. 
Phosphate of Potass, K H 2 P 0 4 . Clear crystals dried at 110°. 
Experiments with Naphtha A. Glass 1. Temperature of the Air 14°-9-16 o, 0. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y- 
X . 
sp. H. 
46-8 
16-9 
16-56 
14-21 
grms. 
26-96 
grms. 
3-95 
grm. 
1-575 
0-431 
grm. 
0-651 
0-200 
48-0 
17-2 
16-89 
14-43 
26-965 
33 
33 
33 
33 
0-209 
47-5 
17-4 
17-09 
14-71 
26-96 
33 
33 
33 
33 
0-203 
48-0 
17-2 
16-92 
14-43 
26-995 
33 
1-56* 
33 
33 
0-218 
Mean . . . 0-208 
* After drying the stopper. 
f Excluding the second experiment. 
