TEVIPEEATtrRE ON THE ELECTEIC CONDirCTING POWEE OE METALS. 15 
T. 
' Conducting power. 
Difference. 
T. 
Conducting power. 
Difference. 
T. 
Conducting power. 
Difference. 
Observed. 
Calculated. 
Observed. 
Calculated. 
Observed. 
Calculated. 
•O 
12-9 
25-27 
40*55 
54-15 
70-53 
83*13 
100-90 
11-4110 
10-9320 
10-3570 
9-8498 
9*2980 
8-9033 
8*3937 
11-4202 
10-9246 
10-3436 
9-8558 
9-3046 
8-9078 
8-3881 
— 0-0092 
+ 0*0074 
+ 0-0134 
-0-0060 
-0-0066 
— 0-0045 
+ 0-0056 
11-80 
26-32 
40-04 
54-02 
70-02 
85-02 
98-50 
11-7144 
11-1287 
10-5805 
10-0451 
9-4883 
9-0102 
8-6158 
] 1-7227 
11*1153 
10-5732 
10-0326 
9-4961 
9-0127 
8-6096 
-0-0083 
+ 0-0134 
+ 0-0073 
-0-0075 
— 0-0078 
— 0-0025 
+ 0-0062 
10-00 
26-54 
39-52 
56-27 
70-30 
85-72 
97*30 
12-649 
11-944 
11-408 
10*717 
10-189 
9-654 
9*279 
12-660 
11-934 
11-391 
10-727 
10-202 
9*657 
9*270 
-0-011 
+ 0-010 
+ 0-017 
-0-010 
— 0-013 
—0-003 
+ 0-009 
The foraiulee deduced from the observations, and from which the conducting powers 
were calculated, were — 
For fii’st wire, . X=ll-9613-0-042902^+0-00007422f. 
For second wme X = 12-2419— 0•044965^^-0•00008213!^^ 
For third wire X=13-1186-0-046561??+0-00007206f. 
XYe see from the results that ■nires 1 and 2 decrease to a small extent in conducting 
power, whereas wire 3 increases slightly after being heated to 100° 
The conducting power of tin was found— 
Q Eedueed to 0°. ' ' 
11-45 at 21-0 ' 12-351; • ' • ' ' . ' ‘ 
and calculating the formida of tin as before, we find 
X=12-366-0-044554^+0-00007588f. 
Lead. 
Purified by reducing by heat the twice recrystallized acetate. Wires 1 and 2 were 
pressed ; wire 3 drawn. Xo permanent alteration in the conducting power of the wires 
was observed after they had been kept at 100° for two days. Table VIII. shows the 
results. 
Table VIII. 
First wire. 
Second wire. 
Third wire. 
■ Length 
Diameter 
416 millims. 
0*669 millim. 
453 millims. 
0-698 millim. 
389 millims. 
0*959 millim. 
Th& means of the conducting powers found for each of the following temperatures 
were-~ 
T. 
Conducting power. 
Difference. 
T. 
Conducting power. 
Difference. 
T, 
Conducting power. 
i 
Difference. 
Observed." 
'Calculated. 
Observed. 
Calculated. 
Observed. 
Calculated. 
14-55' 
25-40 
40-30 
64-80 
70-33 
84-52 
99*35 
7-9365 
7-6129 
7.-2036 
6-8423 
6-4881 
6-1964 
5-9159 
7:9336.. 
7-6152 
7-2071 
6-8420 
6-4863 
6-1929 
5-9189 

+ 0*0029 
-0-0023 
—0*0035 
+ 0-0003 
+ 0-0018 
+ 0-0035 
-0-0030 
14-50 
27-50 
40-37 
54-80 
69-63 
84-80 
100-10 
7*8686 
7-5336 
7-1405 
6*7789 
6-4392 
6-1189 
5-8388 
7-8653 
7-5392 
7-1397 
6-7775 
6-4370 
6*1218 
5-8381 , 
+ 0-0032 
-0-0056 
+ 0-0008 
+ 0-0014 
+ 0-0022 
- 0-0029 
+ 0-0007 
12*40 
26-20 
39-60 
54-60 
69-70 
■84-40 
58-85 
7*9038 
7*4967 
7*1309 
6-7565 
6-4205 
6-1250 
5-8642 
7*i022 
7-4968 
7*1324 
6-7585 
6-4r87 
6-1229 
5-8658 
+ 0*0016 
-d-0001 
— 0*0015 
— O-O0#O 
+ 0-0018 
+ 0-0021 
- 0-0016 
