BARUS.J 
PtfRO-ELECTRIC PROPERTIES OF ALLOYS. 
PURIFIED WIRES. 
143 
A. Thrice 
fused. 
1 19 
i 100 
I 357 
0. 223 1 
0. 273 I 
0. 420 J 
2.90 
2.C5 
C. Thrice 
fused. 
| 19 
< 100 
[ 357 
0. 299 1 
0. 357 I 
0.545 J 
2.52 
2.58 
General digest. — Following, in Table 34, is a general digest of the above 
results, in which density J at zero degrees, specific resistance s t , as 
obtained from thick (I) and from thin (II) wires at mean room tempera- 
tures, mean temperature-coefficient a for the large and the small inter- 
vals 0° to 100° and 0° to 360°, respectively, specific resistance s for 0° 
computed with or, and, finally, the thermo-electric power a per degree 
centigrade at 0°, are carefully inserted. The data for purified wires 
are discussed below: 
Table 34. — Constants of platinum alloys. Digest. 
No. 
Metal alloyed 
to platinum. 
Ao 
I 
(thick) 
St 
II 
(thin) 
St 
10 3 
X a 
II 
(thin) 
so 
10 3 Xa 
[/'(0):/(0)jX10» 

Platinum ..... 
21. 315 
21. 288 
15.30 
18.98 
15.55 
19.13 
2.30 
1.78 
2.22 
1.62 
14.91 
18.53 
540 
2.33 
1 
Gold 
1.84 
2 
....do 
21. 221 
22.44 
22.68 
1.45 
1.33 
22.13 
1812 
1.49 
3 
....do 
21. 172 
25.58 
25.23 
1.27 
1.09 
24.67 
2570 
1.33 
4 
Silver 
21. 163 
19.48 
19.78 
1.80 
1.61 
19.06 
100 
1.87 
5 
....do 
do 
20. 991 
19. 400 
21. 006 
22.79 
34.80 
19.53 
22.96 
34.61 
19.67 
1.46 
1.02 
1.75 
1.02 
0.71 
1.62 
22.28 
33.97 
18.95 
436 
1301 
- 844 
6 
7 
Palladium 
1.79 
8 
....do 
20. 540 
21.40 
21.54 
1.53 
1.48 
20.90 
- 869 
1.55 
9 
....do 
19. 909 
23.86 
24.50 
1.29 
1.18 
23.87 
- 1073 
1.33 
10 
Iridium ........... 
21. 271 
21. 279 
19.87 
21.17 
20.11 
21.07 
1.72 
1.63 
1.61 
1.50 
19.42 
20.40 
- 2548 
- 3904 
1.76 
11 
....do 
1.67 
12 
....do 
21. 319 
24.43 
24.26 
1.28 
1.21 
23.64 
- 5939 
1.30 
13 
Copper 
20. 676 
31.51 
32.27 
0.89 
0.83 
31.75 
- 77 
0.91 
14 
....do 
20. 600 
33.97 
34.06 
0.80 
0.72 
33.59 
1021 
0.83 
15 
....do 
18. 803 
63.82 
63.56 
0.20 
0.20 
63.56 
867 
0.21 
48 
....do 
20. 917 
25.69 
25.98 
1.27 
1.14 
25.29 
- 140 
1.31 
49 
...do 
19. 561 
55.87 
53.78 
0.29 
0.15 
53.60 
915 
0.34 
16 
Nickel 
20. 686 
19. 889 
21.93 
27.51 
22.44 
27.54 
1.68 
1.34 
1.46 
1.19 
21.67 
26.84 
- 4905 
- 9065 
1.75 
17 
....do 
1.39 
18 
... do 
18. 751 
33.71 
33.38 
1.05 
0.87 
32.76 
-11470 
1.11 
19 
Cobalt 
20. 590 
19. 841 
30. 01 
40.21 
29.17 
40.29 
1.09 
0.89 
1.04 
0.74 
28.56 
39.62 
1481 
2560 
1.11 
20 
....do 
0.93 
21 
40 
41 
....do 
do 
19. 329 
19. 100 
20. 992 
34.83 
44.69 
24.45 
31.72 
45.24 
24.68 
1.57 
1.39 
1.30 
0.83 
1.27 
30.70 
3033 
44.57 
23.97 
5519 
1038 
....do 
1.43 
22 
Iron . ......... 
20. 628 
20. 330 
36.80 
37. 57 
36.78 
42. 33 
0.74 
0.66 
0.74 
0.64 
36.33 
41.80 
- 3887 
- 3969 
0.74 
23 
...do 
0.67 
24 
...do 
19. 589 
64.62 
60.28 
0.37 
0.36 
59. 92 
- 4085 
0.37 
42 
...do 
19. 750 
55.55 
62.88 
0.44 
0.39 
62.52 
- 4222 
0.40 
43 
....do 
20. 886 
29.51 
29.39 
1.12 
0.98 
28.75 
- 3246 
1.21 
50 
Steel 
19. 581 
61.70 
60. 51 
0.44 
0.39 
60.16 
- 4500 
0.46 
797) 
