OF CRYSTALS AND OTHER BAD CONDUCTORS. 
480 
Cooling of Nickel-plated Bar. 
t in minutes. 
Temperature. 
- 15-2° C. 
l/v. 
0 
75-4 
•01326 
2 
69-2 
1445 
4 
64-03 
1562 
6 
58-67 
1704 
8 
54-36 
1840 
10 
50T4 
1994 
12 
46'58 
2147 
14 
43-30 
2309 
16 
40T6 
2490 
18 
37-37 
2676 
20 
34-80 
2874 
22 
32-43 
3084 
24 
30-31 
3299 
26 
28-28 
3536 
28 
26-43 
3784 
30 
24-72 
4045 
32 
23-16 
4318 
34 
21-77 
4593 
36 
20-44 
4892 
38 
19-10 
5236 
40 
17-93 
5576 
43 
16-22 
6165 
46 
14-95 
6689 
49 
13-67 
7315 
52 
12-49 
8006 
55 
11-41 
•08764 
60 
9-88 
•1013 
65 
8A1 
1175 
70 
7-21 
1387 
75 
6-26 
1597 
-l/g/ + b 
1 /i'/ h- 2 + b 
— p — (th/cm) 120. 
•9469 
504 
434 
485 
448 
482 
479 
450 
466 
460 
459 
475 
454 
459 
463 
467 
490 
474 
430 
467 
428 
528 
479 
470 
465 
•9454 
Means. 
y -9468 
I 
J 
0 
•9467 
•9462 
•9466 
•9474 
•9454 
The mean of the values of e W fl,,l > 120 j s - 9466 . 
Hence we have 
Therefore 
p 120 (s/i.'cii!,) __ 1 
•9466 
1-0564. 
sh -02383 
cm ~~ -4343 
X 
1 
120 
•0004572. 
Now, m -- 676 grms., .s = 157*6 sq. cms., c = "093. Hence we have 
MDCCCXOit.— a. 
h — -0001804. 
3 it 
