TEMPERATURE ON THE ELECTRIC CONDUCTING-POWER OF ALLOYS. 193 
Table XXII. 
Observed per- 
centage decre- 
ment in the con- 
ducting-power 
between 
0° and 100°. 
Conducting-power. 
Metal. 
Impurity. 
Observed at 0°. 
Calculated for 1 
the pure metal | 
at 0°. 
Lead 
Bismuth 
27-66* 
7-86 
8-53 
Tin 
Copper 
28-71 1 
12-03 
12-39 
Tin .. 
Silver 
30-00 1 
12-39 
11-98 
Gold (hard drawn) 
Copper 
21-871 
56-12 
83-11 
Gold (hard drawn) 
Silver 
26-41 
7206 
83-24 
Copper (hard drawn) 
28-04 
92-50 
98-42 
Copper (hard drawn) 
Zinc 
26-44 
86-49 
99-75 
Copper (hard drawn) 
Gold 
25-90}: 
84 01 
99-64 
Copper (hard drawn) 
Silver 
26-50} 
89-54 
102-95 
Copper (hard drawn) 
Iron, nickel, lead, and suboxide of copper 
24-36 
78-02 
100-43 
Copper (hard drawn) 
Ditto 
24-66 
78-70 
99-67 
Copper (hard drawn) 
Lead, iron, antimony, and suboxide of copper... 
28-30 
94-90 
99-67 
Silver (hard drawn) 
Lead 
19-64 
6700 
113-64 
Silver (hard drawn) 
Tin 
21-59 
73-69 
111-33 
Silver (hard drawn) 
Gold 
2109 
72-72 
112-79 
Silver (hard drawn) 
Copper 
23-17} 
80-28 
110 39 
Silver (hard drawn) 
Copper 
26-51} 
97-71 
112-28 
Silver (hard drawn) 
Minute traces of arsenic 
24-77 
88-93 
111-95 
On comparing the values in Table XXII. for the observed and calculated conducting- 
powers, it will be seen that those calculated for the same metal agree very closely with 
each other, whereas those observed vary in some cases more than 20 per cent. From 
Table XXIII. it is evident that the deduced value for the conducting-power of gold and 
silver is much higher than that found by experiment ; on referring, however, to the paper 
on the influence of temperature on the conducting-power of metals (Table XVI.), it will 
be found that the percentage decrement in the conducting-power between 0° and 100° of 
Silver is 
. 28-44 
Copper is ... , 
. 29-69 
Gold is ... . 
. 21-30 
Tin is ... . 
. 29-89 
Lead is ... 
. 29-61 
Let us now recalculate the deduced conducting-powers, using these values instead of 
the mean of those found for the pure metals (viz. 29-307), and we arrive at much 
better results. These are shown in Table XXIII. 
Table XXIII. 
Deduced from the 
impure metals. 
Conducting-power at 0°. 
Deduced from the 
impure metals, using 
the observed per- 
centage decrements. 
Observed for 
hard-drawn wires. 
Observed for 
annealed wires. 
Lead 
8-53 
8-32 
Tin 
12-19 
12-36 
O DO 
1254 
Gold (hard drawn) 
83-17 
77-96 
79-33 
79-20 
Copper (hard drawn) . . . 
100-06 
99-95 
102-21 
101-91 
Silver (hard drawn) 
112-06 
100-00 
108-57 
107-43 
t From Table XII. 
2 D 2 
* From Table XXVII. 
From Table XIII. 
