TEIMPEEATUEE ON THE ELECTEIC CONDUCTING POWEE OF METALS. 
7 
First wire, hard drawTi. 
Second wire, hard drawn. 
Third wire, hard drawn. 
T. 
Conducting power. 
Difference. 
T. 
Conducting power. 
Difference. 
T. 
Conducting power. 
Difference. 
Observed. 
Calculated. 
Observed. 
Calculated. 
Observed. 
Calculated. 
1 1-00 
26-17 
38-25 
55-40 
68-85 
84-00 
101-30 
102-238 
96-710 
92-490 
87*130 
83-389 
79-540 
75-831 
102-272 
96-645 
92-505 
87-149 
83-374 
79-572 
75-813 
-0-034 
+ 0-065 
— 0-015 
-0-019 
+ 0-015 
— 0-032 
+ 0-018 
12-20 
23-70 
41-70 
56-20 
68-90 
85-45 
99-20 
103-927 
99-520 
93-224 
88-703 
85-142 
81-078 
78-073 
103-927 
99-523 
93-236 
88-7O8 
85-137 
81-036 
78-103 
0-000 
—0-003 
— 0-012 
-0-005 
+ 0-005 
+ 0-042 
-0-030 
9-60 
23-90 
38-95 
56-00 
68-15 
84-47 
98-60 
100-534 
95-452 
90-476 
85-513 
82-244 
78-393 
75-477 
100-546 
95-437 
90-507 
85-478 
82-252 
78-391 
75-484 
— 0-012 
+ 0-015 
— 0*031 
+ 0-035 
— 0-008 
+ 0-002 
— 0-007 
First wire, annealed. 
Second wire, annealed. 
Third wire, annealed. 
11-30 
24-25 
41-85 
56-45 
67-75 
83-65 
98-80 
103-391 
98-589 
92-520 
88-006 
84-670 
80-562 
77-046 
103-404 
98-576 
92-530 
87-965 
84-714 
80-554 
77-042 
-0-013 
+ 0-013 
— 0-010 
+ 0-041 
— 0-044 
+ 0-008 
+ 0-004 
8-00 
24-35 
38-05 
55-17 
68-22 
83-62 
100-00 
106-447 
99-968 
95-051 
89-554 
85-847 
81-882 
78-319 
106-426 
99-990 
95-077 
89-554 
85-803 
81-888 
78-331 
+ 0-021 
-0-022 
-0-026 
0-000 
+ 0-044 
-0-006 
— 0-012 
9-25 
25-55 
40-10 
55-17 
68-55 
83-57 
100-00 
102-543 
96-371 
91-589 
87-055 
83-483 
79-667 
76-124 
102-461 
96-495 
91-630 
87-047 
83-367 
79-674 
76-163 
+ 0-082 
— 0-124 
-0-041 i 
+ 0-008 
+ 0-116 
-0-007 
-0-039 
The formulse deduced from the observations, from which the conducting powers were 
calculated, were — 
For first wire (hard ch'awn) . 
For first wire (annealed) . 
For second wire (hard drawn) 
For second wire (annealed) . 
For third wire (hard drawn) . 
For third wire (annealed) 
A=106-651-0-40948^+0-0010370f. 
A=107•880-0•40698^^+0•0009601^^ 
A = 108-928-0-42389^+0-0011407f. 
A=109-802-0-43138^+0-0011667^l 
A = 104•209-0•39124^+0■0010133^;^ 
A=106-088-0-40160?^+0-0010235^l 
From the above Table it will be seen that, after heating a silver wire to 100° C. for 
some days, its conducting power is increased almost to the same extent as if it had been 
annealed, and that wires 1 and 2 were not completely hard drawn. On comparing the 
difference in the conducting powers produced by annealing the wires, we find for wire 3 
it is only 6 per cent., whereas for wire 2 it is almost 10 per cent., taking the conducting 
power of the hard-drawn silver wire 
= 100. In a former 
research* this difference was 
found to be — 
0 
Eeduced to 0°. 
1. 
Hard drawn 
. 95-28 at 14-0 
100-47 
Annealed .... 
. 103-98 at 14-8 
109-98 
2. 
Hard drawn 
. 95-36 at 14-6 
100-78 
Annealed .... 
. 103*33 at 14-6 
109-20 
* Philosophical Transactions, 1860. 
