TmiPEEATUEE OF THE ELECTEIC CONDUCTIN'G POWEE OF METALS. 
9 
First wire, hard drawn. 
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. 
16-86 
29-88 
51-03 
69-52 
83-77 
98-60 
95-473 
91*063 
84-235 
78-997 
75-413 
71-829 
95-467 
91-002 
84-315 
79-044 
75-347 
71-838 
+ 0-006 
+ 0-061 
— 0-080 
- 0-047 
+ 0-066 
- 0-009 
19-17 
30-95 
48-53 
69-22 
83-77 
99-00 
94-359 
90-187 
84-518 
78-640 
75-015 
71-532 
94-334 
90-208 
84-544 
78-634 
74-968 
71-562 
+ 0-025 
- 0-021 
— 0-026 
+ 0-006 
+ 0-047 
- 0-030 
12-65 
25-61 
39-52 
53-92 
69-90 
84-87 
99-92 
95-769 
91-061 
86-415 
82-069 
77-798 
74-172 
70-951 
95-739 
91-076 
86-456 
82-090 
77-741 
74-142 
70-987 
+ 0-030 
- 0-015 
— 0-041 
— 0-021 
+ 0-057 
+ 0-030 
— 0-036 
First wire, annealed. 
Second wire, annealed. 
Third wire, annealed. 
17-00 
29-63 
50-22 
69-60 
83-42 
99-39 
95-535 
91-291 
84-687 
79*223 
75-636 
71-891 
95-567 
91-239 
84-726 
79-209 
75-638 
71-893 
- 0-032 
+ 0-052 
- 0-039 j 
+ 0 014 I 
— 0-002 
— 0-002 
18-96 
31-86 
52-05 
70-27 
83-81 
99-57 
94-987 
90-424 
83-974 
78-836 
75-428 
71-757 
94-959 
90-449 
84-003 
78-829 
75-377 
71-784 
+ 0-028 
— 0-025 
— 0-029 
+ 0-007 
+ 0-051 
- 0-027 
13-45 
26-15 
39-35 
55-50 
69-90 
84-67 
99-05 
96-954 
92-246 
87-727 
82-675 
78-742 
75-047 
71-766 
96-934 
92-260 
87-753 
82-722 
78-686 
74-988 
71-816 
+ 0-020 
- 0-014 
— 0-026 
- 0-047 
+ 0-056 
+ 0-059 
— 0-050 
For first wire (hard drawn) . 
For first wire (annealed) . . 
For second wire (hard drawai) 
For second wire (annealed) . 
For third wire (hard drawn) . 
For third wire (annealed) . . 
The formulee deduced from the observ'ations, from which the conducting powers were 
calculated, were — 
. X=101-645-0-37963?^+0-0007844f. 
. A=101-791-0-37959i5-f0-0007921^^ 
. X=101•614-0•39806^^+0•0009546^^ 
. X=102-143-0-39629^+0-0009179^^ 
. X=100-620-0-39885^+0-0010236i5^ 
. X=102-243-0-40850^+0-0010228f. 
The observations made with wires 1 and 2 were as follows: two at each interval on 
heating and two on cooling ; again, two on heating and two on cooling, as shown in 
Table I. 
On looking at the above, we observe that wire 1, after having been kept at 100° for 
several days, increased in conducting pow’er almost to the same extent as if it had 
been annealed, wire 2 partially so, and wire 3 hardly at all. The annealing took place 
in a glass tube heated with a 4-Bunsen burner, whilst a current of hydrogen passed 
through it. Here, again, as in the case of the silver wire, we may assume that the 
formulae of the hard-drawm and annealed copper wires are the same. In a former 
0 
Eeduced to 0°, 
1. 
93-00 at 18-6 
99-877 
2. 
93-46 at 20-2 
100-980 
3. 
92-02 at 18-4 
99-824 
4. 
92-76 at 19-3 
99-886 
5. 
92-99 at 17-5 
99-453 
* 
Philosophical Transactions, 1860. 
3JDCCCLXII . 
