178 
DES. A. MATTHIESSEN AND C. VOGT ON THE INFLUENCE OF 
Table VI. (continued). 
4. 
5 . 
*(• Arsenic-copper, containing 2*8 per cent, by weight of 
arsenic (hard drawn). 
Length 547 millims. ; 
Conducting-power found before 
heating the wire 
Ditto, after being kept at 100“ 
for 1 day 
Ditto, for 2 days 
diameter 0-431 millim. 
12-2980 at 8-9 
12-2648 at 9-5 
12-2369 at 119 
Eedueed to 0°. 
12-3787 
12-3507 
12-3443 
T. 
Conducting-power. 
Difference. 
Observed. 
Calculated. 
13-60 
24-75 
39-78 
54-72 
69-11 
84-72 
100-28 
12-1933 
12-0937 
11-9648 
11-8364 
11-7152 
11-5837 
11-4631 
12-1930 
12-0945 
11-9635 
11-8358 
11-7151 
11-5867 
11-4614 
+0-0003 
-0-0008 
+0-0013 
+0-0006 
+0-0001 
-0-0030 
+0-0017 
X - 1 2-3 156 - 0-0090694*:+0-000005496*: 2 . 
■(•Arsenic-copper, containing traces of arsenic 
(hard drawn). 
Length 381 millims. ; 
Conducting-power found before 
heating the wire 
Ditto, after being kept at 100° 
for 1 day 
Ditto, for 2 days 
Ditto, for 3 days 
diameter 0-364 millim. 
58-680 at 16-4 
58- 924 at 14-5 
59- 286 at 12-7 
59 013 at 14-1 
Deduced to 0°. 
61-255 
61-207 
61-295 
61-236 
T. 
Conducting-power. 
Difference. 
Observed. 
Calculated. 
14-65 
58-948 
58-931 
+0-017 
23-85 
57-533 
57-546 
-0-013 
39-95 
55-226 
55-244 
-0018 
54-48 
53-298 
53-299 
-0-001 
69-26 
51-464 
51-448 
+0-016 
83-47 
49-801 
49-790 
+0011 
98-62 
48-141 
48-154 
-0-013 
X=61-238-0-16183*+000002957rf 2 . 
Tables VII., VIII., IX., and X. contain (1) the values found in a former research*, 
reduced to 0° with the help of the formula given in the above Tables for some of the 
alloys (column A.), (2) the values taken from the above Tables, namely, the first 
observed conducting-power reduced to 0° (column B.), and (3) the formulae for the 
correction of the conducting-power for temperature, taking the mean of the values in 
the columns A. and B. as the conducting-power at 0°. 
Table VII. 
Alloy. 
Volumes 
Conducting-power. 
Formula for the correction of the conducting- 
per cent. 
A. 
B. 
power for temperature. 
Sn c Pb 
83-96 of Sn 
11-582 
12-423 
X= 1 2002 - 0-046645#+0 0001 042*f 2 
Sn 4 Cd 
83-10 of Sn 
14-459 
14-658 
X=14-558— 0-059337*+ 0-0001728*: 3 
Sn 2 Zn 
77-71 of Sn 
16-504 
16991 
X=16747 — 0-065044+0 0001460*: 3 
Pb Sn 
53-41 of Pb 
9-855 
10-423 
X=l0-139-0-038358+000008536*: 3 
Zn Cd , 
26 06 of Zn 
25-405 
25-834 
X =25-6 1 9 - 0096978+00002049*: 2 
Sn Cd) 
23-50 of Sn 
21-194 
22123 
X=21 -658 -008336S+0-0002038*: 2 
Cd Pb c 
10-57 of Cd 
9047 
9-264 
X= 9T55- 0-032041+0-00006647*: 2 
Table VIII. 
Alloy. 
Volumes 
Conductin g-po wer. 
Formal* for the correction of the conducting- 
per cent. 
A. 
B. 
power for temperature. 
Lead-silver 
94-64 of Pb 
8-823 
8-938 
X= 8-880 — 0032149*: +000007070*: 3 
Lead-silver 
46-90 of Pb 
12-071 
13391 
X=12-731 -0-024986*: +0 0000394 7*! 2 
Lead-silver 
30-64 of Pb 
21-874 
\=21-874 -0043652*: +000005687*: 2 
Tin-gold 
90-32 of Sn 
8-2418 
4-5500 
X= 8-2418-0025418*: +000005472*: 2 
X= 4-7963-0-014006*: +000003020*: 2 
Tin-gold 
79-54 of Sn 
5 0427 
Tin-copper (hard drawn) 
93-57 of Sn 
12034 
X=12034 -0-044328*: +000009781*: 2 
Tin-copper (hard drawn) 
83-60 of Sn 
12-764 
X=12-764 -0-042457*: +000008734*: 2 
Tin-copper (hard drawn) 
14-91 of Sn 
8-823 
X= 8-8223— 00048266*+0000002593*: 2 
Tin-copper (hard drawn) 
12-35 of Sn 
10-154 
X=10154 — 0-0067 656+0-00001 203*: 2 
Tin-copper (hard drawn) 
11-61 of Sn 
12-102 
X = 12T02 - 00083587+0000003674*! 3 
Tin-copper (hard drawn) 
6-02 of Sn 
19-750 
19-682 
X=19'716 -0-019626*: +0-00001390^ 
Tin-copper (hard drawn) 
1-41 of Sn 
62-463 
X= 62-463 -0-16713*: +00003136*: 2 
X= 12-384 -0 047293*: +0-0001014*: 2 
X=13-706 -0-051720*: +0-00011 72t 2 
Tin-silver 
75-51 of Sn 
1 2*378 
13*547 
12.390 
13-866 
Zinc-copper (hard drawn) 
42 06 of Zn 
21-793 
X=21-793 -0-029939*: +0-0000291 6*: 3 
Zinc-copper (hard drawn! 
29-45 of Zn 
21-708 
X=21-708 -0-027632*: +0 00002698*: 2 
X=28-29S -0040039*: +0-00003832*: 3 
Zinc-copper (hard drawn) 
23-61 of Zn 
28-298 
Zinc-copper (hard drawn! ... 
10-88 of Zn 
46-934 
X=:46-934 -0095947*: +00001423*: 2 
Zinc-copper (hard drawn) 
5-03 of Zn 
60-376 
X=60-376 —0-14916*: +0 0002473*! 2 
* Philosophical Transactions, I860, p. 166. 
