TEMPEEATTJKE ON THE ELECTEIC CONDHCTINa POWEE OE METALS. 17 
Taking the mean of the conducting powers at 0°, we deduce the formula for the 
correction of conducting power for temperature to be 
X=4-7623-0'018571#+0-00004228f. 
Antimony. 
Purified by twice recrystallizing commercially pure tartrate of antimony and potas- 
sium, reducing by heat and re-fusing with antimonic acid. As antimony is so very 
brittle, it was not possible to manipulate with it in form of wire, it was therefore fused 
in the bowl of a tobacco-pipe, and when liquid allowed to run into the stem. After 
breaking ofi“ the bowl, the ends of the pipe were made so hot that the metal melted, 
and clean copper whes were pushed into the liquid metal, which on solidifying held them 
fast. The free ends of the copper wires were then soldered to the thick ones in the 
trough. Unfortunately in each case the copper wires in the pipe-stem became loose 
after heating for two or three days, and had to be therefore resoldered, so that no 
reliable determinations could be made as to the effect of heating to 100° for several days 
on the conducting power. It may be stated that the three wires lost in conducting 
power ; but to what extent, we are of course not in a position to say. As the diameter 
of the pipe-stem could not be accurately determined, and as it could not be ascertained 
whether there were cavities in the wires (caused by contraction on cooling and crystalliza- 
tion) or not, the first observed conducting power was taken equal to 100. Table X. 
shows the results. 
Table X. 
The means of the conducting powers found for each of the following temperatures 
were — 
First wire. 
Second wire. 
Tliird W’ire. 
T. 
Conducting power. 
Difference. 
T. 
Conducting power. 
Difference. 
T. 
Conducting power. 
Difference. 
Observed. 
Calculated. 
Observed. [ Calculated. 
Observed. 
Calculated. 
10-00 
26-35 
40-40 
54-55 
70-65 
83-50 
99-40 
100-000 
94-062 
88-982 
84-633 
80-126 
77-071 
73-430 
100-052 
93-910 
89-089 
84-664 
80-152 
76-953 
73-484 
— 0-052 
+ 0-152 
-0-107 
-0-031 
-0-026 
+ 0-118 
-0-051 
o 
8-40 
25-60 
42-45 
57-80 
69-45 
86-85 
101-25 
100-000 
93-947 
88-139 
83-707 
8 O- 69 I 
76-138 
72-922 
99-999 
93-850 
88-329 
83-731 
80-517 
76-159 
72-953 
+ 0-001 
+ 0-097 
-0-190 
— 0-024 
+ 0-174 
— 0-021 
— 0-031 
13-80 
22-30 
38-65 
53-50 
69-65 
84-45 
98-80 
100-000 
96-378 
90-552 
85-671 
81-118 
77-480 
74-448 
99-901 
96-514 
90-527 
85-692 
81-082 
77-454 
74-480 
+ 0-099 
— 0-136 
+ 0-025 
— 0-021 
+ 0-036 
+ 0-026 
-0-032 
The formulae deduced from the observations, from which the conducting powers were 
calculated, were — 
For first whe . X=104-095 — 0'41487if-l-0-0010755^^ 
For second wire X=:103T90 — 0-38721^+0-0008748f. 
For third wire . X = 105-801-.0-44541^+0-0012995f. 
ilDCCCLXII. D 
