168 
DE. A. IVIATTHrESSEX OX THE ELECTEIC 
not be pressed; even gold alloyed with 0-25 per cent, of lead could not be di‘awn; it 
appears to be perfectly rotten. Most of the gold-lead alloys which were determined 
were much more brittle than glass. The gold-tin alloys, although just fusible enough 
to press, were yet excessively brittle. Silver with lead and tin could only he pressed 
or drawn within certain limits ; and where no wii’es could be obtained, that portion 
of the curve is denoted by dotted lines. Nearly all the gold alloys, especially those rich 
in gold, were made with gold which had been precipitated by algaroth powder. tScc. 
(see Appendix). 
In Table V. are given some experiments made with certain commercial metals 
alloyed with pure tin or lead. The values are the mean of two detenninations ; and 
from the values found we see that they all belong to Class B, as they all conduct less 
than the calculated values. 
Table V. 
Mean of 
Conducting power. 
Temperature. 
Hg Sn 
3-78 
22-0 
Pb alloyed with 10 per cent. Pd 
6-22 
24*5 
Sn alloyed with 10 per cent. Pd 
9-06 
24-2 
Pb alloyed with 10 per cent. Pt 
5-18 
21-4 
Sn alloyed with 10 per cent. Pt 
9-37 
21-1 
Sn alloyed with 2*5 per cent. Fe* ... 
9-71 
20-5 
Zn alloyed with 10 per cent. A1 
24-02 
24-5 
4, 
On the Conducting Power of Alloys made of the Metals of Class B. ivith one another. 
The values found for these alloys are given in Table YI., and then- curves on 
Plate V. 
Table VI. 
Bismuth-Gold Series. 
Alloy. 
Volume per cent. 
Mean of 
Calculated con- 
ducting power 
from the volmue. 
Conducting power. 
Temperatm-e. 
Bigo An 
Bi 
99-47 
1-01 
24-0 
1-57 
Bi^i) Au 
98-81 
0-998 
21-6 
2-04 
B'2() Au 
97-64 
1-09 
19-9 
2-88 
Big Au 
94-31 
1-25 
21-9 
5-27 
Bi^ Au 
89 23 
1-42 
22-6 
8-92 
Bi^ Au 
80-55 
1*82 
13-7 
15-14 
Bi Au 
67-43 
2-95 
14-3 
24-55 
* The iron in this alloy was determined ; the numbers placed by the side of the metals denote the pei’- 
centage by w'eight. 
