TEMPERATURE ON THE ELECTRIC CONDUCTING-POWER OF ALLOYS. 189 
II. Experiments on the Influence of Temperature on the Electric Conducting-power of 
some Alloys composed of three Metals. 
In the course of the foregoing experiments we were induced to try whether the 
influence of temperature on the conducting-power of the three metal alloys would be 
regulated by the above law, and Tables XVIII. and XIX. contain the results. 
Table XVIII. 
Gold-copper-silver alloy, containing 50 volumes per cent, gold, 25 copper, and 25 silver (hard drawn). 
Length 341-5 millims. ; diameter 0-618 millim. 
Conducting-power found before heating the wire 10-6186 at 13-7 
Ditto, after being kept at 100° for 1 day 10-6367 at 6-0 
Ditto, for 2 days 10-5855 at 6 - 7 
T. 
Conducting-power. 
Difference. 
Observed. 
Calculated. 
10-75 
10-5637 
10-5617 
+0 0020 
33-52 
10-4341 
10-4346 
-0-0005 
55-15 
10-3130 
10-3148 
-00018 
78-35 
10-1846 
10-1873 
-0-0027 
97-52 
10-0857 
10-0828 
+0-0029 
Reduced to 0°. 
10-6960 
10-6681 
10-6232 
\=10-6220— 0 0056248*;+00000009863!! 2 . 
2 . 
Gold-copper-silver alloy, containing 40*67 vols. per cent, 
gold, 39*81 copper, and 19*52 silver (hard drawn). 
Length 532 millims. ; diameter 0-625 millim. 
Conducting-power found before 0 Reduced to 0°. 
heating the wire 12-007 at 15-1 12-109 
Ditto, after being kept at 100° 
for 1 day 11-978 at 15-5 12-083 
Ditto, for 2 days 11-915 at 16-5 12 026 
Ditto, for 3 days 11-914 at 15-9 12-020 
T. 
Conducting-power. 
90 
11-956 
54-5 
11-647 
100-0 
11-438 
X = 12017 - 0-0069033^+0-00001 lilt 2 . 
3. 
Gold-copper-silver alloy, containing 3*67 vols. per cent, 
gold, 83*32 copper, and 13*01 silver (hard drawn). 
Length 764 millims. ; diameter 0-553 millim. 
Conducting-power found before 0 Reduced to 0°. 
heating the wire 44-820 at 18-4 44-272 
Ditto, after being kept at 100° 
for 1 day 42-994 at 17-1 44-348 
Ditto, for 2 days 42-983 at 18-2 44-424 
Ditto, for 3 days 43-047 at 17-0 44-395 
T. 
Conducting-power. 
110 
43-591 
55-5 
40-300 
100-0 
37-560 
X =44-472 — 0-081525^+0-0001 240^ 2 . 
Table XIX. 
Alloy. 
Volumes per cent. 
Conducting-power at 100°. 
Percentage decrement. 
Observed. 
Calculated. 
Observed. 
Calculated. 
Gold-copper-silver 1 
(hard drawn). ) 
50 Au 
25 Cu 
25 Ag 
j 10-14 
62-89 
5-20 
4-72 
Ditto | 
40-67 Au 
39-81 Cu 
19-52 Ag 
| 11-52 
64-34 
4-82 
5-25 
Ditto | 
3-67 Au 
83-32 Cu 
13-01 Ag 
| 37-39 
7009 
15-54 
15-63 
Argentan | 
12-84 Ni* 
36-57 Zn 
50-59 Cu 
| 7-46 
44-44 
4-39 
4-93 
* Values found by analysis. Of this wire all our normal wires were made. According to former experi- 
ments (Philosophical Transactions, 1862, p. 5), the formula for the correction of conducting-power for tempe- 
rature of this alloy was 
^Ysoa-o-ot^eige+o-oooooososi* 2 . 
