CONDUCTING POWEE OF ALLOTS. 
163 
3. On that of alloys made of the metals of Class A. with those of Class B. 
4. On that of alloys made of the metals of Class B. with each other. 
5. General conclusions. 
1. On the Conducting Power of the Metals employed. 
They have all been redetermined, and the values found the same as those given in 
my paper “ On the Electric Conducting Power of the Metals*,” with the exception of 
gold (see Appendix at the end of this paper) and copper (“ On the Electric Conducting 
Power of Copper,” &c.). These values are given in Table II. 
Table II. 
Specific graTities 
used for the 
calculation of 
the result. 
Metal. 
Conducting power. 
Equivalent used. 
10-468 
Silver 
100 at 0 
108 
8-921 1 
19-265 
Copper 
93-16 at 19-4 
Gold 
72-88 at 21-3 
197 
Aluminium 
33-76 at 19-6 
7-148t 
Zinc 
27-39 at 1?6 
32-6 
8-655 
Cadmium 
22-10 at 18-8 
56-0 
Iron^ 
14-14 at 20-4 
Palladium 
12-64 at 17-2 
7-294 
Tin 
11-45 at 21-0 
58 
Platinum 
10-53 at 20-7 
11-376 
Lead 
7-77 at 19-3 
103-7 
6-713 
Antimony 
4-29 at 18-7 
122-3 
13-573 
Mercury 
1-63 at 22-8 
100 
9-822 
Bismuth 
1-19 at 13-8 
208 
2 . 
On the Conducting Power of the Alloys made of Metals belonging to Class A. with 
one another. 
The mean of the three determinations found for the conducting power of these alloys 
is given in Table III., and also their calculated conducting powers, supposing that the 
conducting powers of the metals employed take part in that of the alloy in the ratio of 
their relative volumes || . 
* PHlosophical Transactions, 1858. 
t Taken from Gmelin’s ‘ Chemistry,’ as no concordant results could he obtained. 
X Prepared by distilling zinc which contained no arsenic. Three determinations, the pieces being re- 
[7-144 15°-5'| 
fused between each, gave 7-150 l4°-4 mean 17-148 at 15°. 
[7-149 15°-oJ 
§ The iron used in making the alloys was precipitated galvano-plastically by a very weak current from a 
solution of pure protosulphate of iron. 
II ) where P= conducting power of the alloy. 
V and u'= the volumes of the two metals used. 
c and c'= their respective conducting powers. 
Z 2 
