170 
DE. A. MATTHIESSEX OX THE ELECTEIC 
Table VI. (continued.) 
Copper-Silver Series. 
Alloy. 
Volume per cent. 
Mean of 
Calculated con- 
ducting power 
from the volume. 
Conducting power. 
Temperature. 
Cu and Ag 
Cu 
98-96 
86-91 
20-7 
93-23 - 
Cu and Ag 
97-94 
79-38 
19-7 
93-30 
Cu and Ag... 
94-84 
75-64 
20-0 
93-51 
Cu and Ag 
89-83 
69-92 
21-1 
93-86 
Cu and Ag 
78-33 
67-82 
18-8 
94-64 
Cu and Ag 
67-45 
67-90 
19-0 
95-38 
Cu and Ag 
63-29 
68-16 
22-2 
95-67 ’ 
Cu and Ag 
45-37 
67-43 
19-0 
96-89 
Cu and Ag 
38-87 
64-94 
19-6 
97-34 
Cu and Ag 
28-21 
63-71 
17-2 
98-07 
Cu and Ag 
17-84 
63-71 
17-0 
98-74 
Cu and Ag 
13-15 
67-44 
17-5 
99-10 
Cu and Ag 
6-12 
74-48 
16-8 
99-58 
Cu and Ag 
3-23 
78-23 
17-1 
99-78 
Cu and Ag 
2-01 
83-87 
17-0 
99-86 
All hard drawn, and the silver determined. 
Of the bismuth-gold alloys very few could be determined, as bismuth makes gold 
exceedingly brittle. Gold could not be drawn with 0*25 per cent, of bismuth. "With silver- 
bismuth, however, better results were obtained. The bismuth-antimony alloys were deter- 
mined, but as no concordant results were obtained, they will not be given ; the curve, 
however, appeared to be similar to those of this class. 
On looking at the gold-silver alloys, we find that 
Au Ag conducts 14-59 ; 
Aua Ag and AgaAu conduct respectively 16-20 and 16-30 ; 
Au 4 Ag and Ag 4 Au conduct respectively 20-91 and 20-94 ; 
Aug Ag and Agg Au conduct respectively 24-99 and 25-29 ; 
and from these points the difference becomes greater as we approach the pure metals. 
197 
But as 1 equivalent of gold=Yg: 2 ^ = 10'226 volumes, and 1 equivalent of silver 
108 
= Yq:^^ = 10-317 volumes, we may regard the alloy Au Ag as being composed of 1 vo- 
lume of gold-fl volume of silver; and within the above limits we may add to the alloy 
Au Ag equal amounts of gold or silver and obtain the same conducting power, showing 
that gold and silver within these limits, when alloyed with one another, have the same 
conducting power. The same remarks hold good for some gold and copper alloys. 
The curves of the alloys of this class show that there is a rapid decrement on both 
sides, of which I shall speak shortly. 
