312 
the ratio of the resistance at hydrogen temperature to the zero 
resistance is less for the disc than for the wire Bij, so 
dise wire 
for ff = 11090. at. = 203 Ed ce Oh eee 
We We 
In the case of Bir; both the negative temperature coefficient and 
the smallness of the change of resistance with magnetic field indicate 
the presence of impurities. 
TABEE WY. 
The HALL constant, asymmetry and resistance 
change for Bim: 
1202; 
H | — ’ 
RH —R Asym. | Ei r 
2850 247 Xx 103 86.6 | 131 108 2.16 
4700 426 90.7 210 2.91 
6675 624 93.5 280 3.67 
8275 814 | 98.5 346 4.44 
10160 1007 99.2 400 52 
| 11100 1105 99.4 425 5.49 
| | | 
With the disc 52,777 measurements were made only at hydrogen 
temperatures, but we give the results here as, just as with Bir, R 
increases with HH, and approaches a limiting value, approximately 
100; this is the highest Hai coefficient yet obtained for bismuth. 
All the coefficients we have obtained for bismuth plates are negative. 
Circumstances which give rise to positive *) coefficients occur only in 
certain positions of the crystalline axis and therefore, since all posi- 
tions of the axis occur at random, they are obseured by those which 
give rise to negative coefficients. 
12220 Mone rl 1216 99.5 460 5.87 
ll. Other Metals. 
§ 5. Experimental method. This was just the same as for bismuth. 
A Tuomson differential galvanometer was used for observing the HALL 
effect. Now the contacts were not soldered with Wooo’s alloy, but 
with tin. 
1) Here total coefficients are considered, cf, Comm. N?. 129c. [Note added in 
the translation]. 
