TEMPEEATUEE ON THE ELECTEIC CONDUCTING-POWEE OF ALLOYS. 177 
Table V. (continued). 
20. 
Iron-gold alloy, containing 21 -18 volumes per cent, of 
iron (bard drawn). 
Length 184 millims. ; 
Conducting-power found before 
heating the wire 
Ditto, after being kept at 100° 
for 1 day 
Ditto, for 2 days. 
diameter 0-943 millim. 
0 Reduced to 0°. 
1-9299 at 14-6 2 0121 
1-9981 at 10-8 2-0614 
1-9866 at 13-2 2-0621 
T. 
Conducting-power. 
14-0 
1-9822 
57-0 
1-7951 
100-7 
1-7010 
X = 2-0632 — 0-006 1367 #+0-000025 15 # 2 . 
The conducting-power of a se- 0 Reduced to 0°. 
cond wire was found 1-8745 at 17"2 1-9681 
Table VI. 
i. 
-('Phosphorus-copper, containing 2’5 per cent, by 
weight of phosphorus (hard drawn). 
Length 124 millims. ; diameter 0-355 millim. 
Conducting-power found before 
heating the wire 
Ditto, after being kept at 100° 
for 1 day 
Ditto, for 2 days 
Reduced to 0°. 
7-2993 at 12-6 7 3432 
7-3287 at 12-3 7-3717 
7-3424 at 13-6 7-3901 
T. 
Conducting-power. 
Difference. 
Observed. 
Calculated. 
14-52 
7-3395 
7-3391 
+0-0004 
34-22 
7-2696 
7-2708 
-0-0012 
56-25 
7-1963 
7-1954 
+0-0009 
77-35 
71243 
7-1241 
+0-0002 
99-08 
70515 
7-0517 
-00002 
X = 7-3900 - 0-0035 1 94#+0-000001062# 2 . 
21 . 
Iron-gold alloy, containing 10-96 volumes per cent, 
of iron (hard drawn). 
Length 226 millims. ; diameter 0-470 millim. 
Conducting-power found before 0 
heating the wire 2-3450 at 15-6 
Ditto, after being kept at 100° 
fori day 23549 at 13-8 
Ditto, for 2 days 2-3585 at 10-4 
Reduced to 0°. 
. 2-3624 
2-3704 
2-3703 
T. 
Conducting-power. 
12-0 
2-3573 
560 
2-3138 
100-0 
2-2798 
X = 2-3708- 0-001 1555#+00000002454# 2 . 
2 . 
fPhosphorus-copper, containing 0-95 per cent, by 
weight of phosphorus (hard drawn). 
Length 265-5 millims. ; diameter 0-396 millim. 
T. 
Conducting-power. 
Difference. 
Observed. 
Calculated. 
11-05 
23-028 
23 032 
-0004 
24-50 
22-637 
22-635 
+0-002 
39-72 
22-209 
22-203 
+0-006 
54-96 
21-785 
21-787 
-0-002 
69-48 
21-407 
21-408 
-0-001 
84-92 
21-017 
21-023 
—0-006 
99-83 
20-673 
20-668 
+0-005 j 
The conducting-power of a se- 0 Reduced to 0°. 
cond wire was found 2-2397 at 17-2 2-2580 
X = 23-368 - 0-030873#+0-00003836# 2 . 
22 . 
Iron-copper alloy, containing 0-46 volume per cent, of 
iron (hard drawn). 
Length 573-5 millims. ; diameter 0-358 millim. 
Conducting-power found before 
heating the wire 
Ditto, after being kept at 100° 
for 1 day 
Ditto, for 2 days 
Ditto, for 3 days 
Ditto, for 4 days 
Ditto, for 5 days 
38- 315 at 9-0 
39- 055 at 9-4 
39-124 at 10-4 
39-241 at 10-0 
39-313 at 11-0 
39-384 at 8-8 
Reduced to 0°. 
38- 852 
39- 626 
39-758 
39-852 
39-986 
39-887 
T. 
Conducting-power. 
10-0 
39-283 
55-0 
36-739 
100-0 
34-533 
3. 
f Arsenic-copper, containing 5*4 per cent, by weight 
of arsenic (hard drawn). 
Length 225 millims. ; diameter 0-289 millim. 
Conducting-power found before 0 Reduced to 0°. 
heating the wire 6-3518 at 9-3 6-3739 
Ditto, after being kept at 100° 
for 1 day 6-3780 at 8-4 6-3980 
Ditto, for 2 days 6-3800 at 7"9 6-3988 
T. 
Conducting-power. 
Difference. 
Observed. 
Calculated. ' 
10-52 
6-3742 
6-3738 
+0-0004 
31-80 
6-3230 
6-3235 
-0-0005 
54-20 
6-2707 
6-2713 
-0-0006 
75-58 
6-2232 
6-2220 
+0-0012 
98-05 
6-1703 
6-1708 
-0-0005 
X = 39-894 - 0-06 1 958#+ 0-00008346# 2 . 
2 B 2 
X=6-3989-0-0023880#+0-0000006331# 2 . 
