6i6 
PHYSICS: E. H. HALL 
Proc. N. a. S. 
In the following tables, as in the corresponding tables of my March 
paper, the metals are divided into four groups, according to their values 
of Ki and /v2 in the equation a = {Ki + K2t)T. Two alloys also, 
const ant an and manganin, are dealt with according to the data given for 
them by Bridgman. In finding ^loo, the electrical conductivity at 100° 
C, from ko , the conductivity at 0° C, I have used Bridgman's temperature 
coefficients; but he, working with very fine wires, did not determine the 
absolute conductivity at any temperature. The values of and ^loo 
given in the first line beneath the name of any metal are derived from 
the work of Jaeger and Diessel-horst, except in those cases where a 
footnote is referred to. They are expressed in cal./cm., sec, deg. C. 
C, Ci and G are constants in the equation 
{Kf ~ K) = C C,t + C2t\ 
The 8c of these tables is the constant part of the "ionizing potential," 
expressed in volts; is the total ionizing potential at 0° C, and 6ioo is 
the total ionizing potential at 100° C. 
The letter y indicates the estimated percentage of atoms which are 
ionized at 0° C. The method of estimation is given later. 
First Group: Metals for which Ki > 0 and K2 — 0. 
Table 1 : Cobalt 
ko = 102 X 10-«;y^ioo = 74.7 X I0-^;do = 0.16] dim = 0.164;i (do ^ dm) = X.098 
o- 7.8 Tergs/deg. C. 
If g = 1.55 and 5 = 4 and X'o = 42 R, C, = 230 X lO'^ and C = 0.256 
(-0 
7 
80 
5ioo 
(S). 
\dTj,oo 
X 106 
X106 
1 
0.279 
6.7% 
0.004 
0.098 
0.132 
-8920 
-9720 
76.0 
54.0 
0.157 
0.165 
0.95 
1 Lacking observed values of do and 6m for cobalt, I have estimated the values here 
given by use of the Wiedemann-Franz ratio (average for 13 metals) applied to ko and *ioo. 
Table 2: Nickel 
^ 93 X 10-6; km = 62.5 X lO""; do = 0.143; ^100 = 0.138; (^o ^ 6) = 1.04 
a = 3.56 T ergs/deg. C. 
liq = 1.55 and 5 = 4 and X'o = 100 R, Ci = 105 X lO"" and C = 0.239 
0.250 
5.7% 
0.009 
0.103 
0.137 
-8330 
-8710 
70.8 
46.9 
0.144 
0.133 
1.08 
Table 3: Palladium 
ko = 100 X 10-«; km = 75.9 X lO'^; do = 0.165; ^100 = 0.182; (^0 ^100) - 0.91 
a - 3.52 T ergs/deg. C. 
If 5 - 1.6 and s - 6 and X'o = 114 R, G = 69.8 X lO'^ and C = 0.0987 
0.106 
3.2% 
0.010 
0.151 
0.203 
-5180 
-5550 
90.1 
67.9 
0.168 
0.182 
0.92 
