662 
TABLE XIII. 
HALL coefficient R. 
| | | 
Tr in tat pote ree 
= i == | EEE 
290°K. || 7.24 > 104) 8.00 X 104 4.92 10—-4| 6.15 & 10+ 
j ] 
|| | 
909 || 7.61 | 8.21 | 5.56 6.99 
Tie || 7.62 tide Ve — 
TABLE XIV. | 
| Variation of the Hatt coefficient mes | 
| 200°K 
| 
Pe AE Pao 
aia = a “pl a! == A851 “pl | Ppl | 
200°K. || 1 4 1 | ee ee) 
90° 105 | 1.025 | 113 | 1.035 
| | | 
ade 105 | — | — | — 
From these observations, therefore, the Hatt coefficient for Au, 
Ag and Pd is almost constant from ordinary temperature down to 
that of liquid air. A distinct increase is first observed on proceeding 
to hydrogen temperatures *), which amounts to 25—35'/, for Gold, 
Silver and Copper, and 100°/, in the case of Palladium. 
Rg3e K 
A. W. Sirs?) gives the following values for the ratio or 
Au Ag Cu Pd 
1.03 1.095 1.205 1.27 
This gives agreement in the case of Aw, but with Ag and Cu, 
and particularly with Pd, Smrrn’s results deviate considerably from 
mine. In the case of Cu and Ag the lack of agreement may perhaps 
be ascribed to the presence of impurity. 
The relationship 
293°. KK 
ST 
R == 
TRS NE 
deduced for the Hatt effect by R. Gans*) has been utilised by 
1), H. KAMERLINGH Onnes and Benet BeckMay, Ì. c. 
2) A. W. Smita, Phys. Rev. 30. 1. 1910. 
5) R. Gans, Ann. d. Phys. 20. 293. 1906, 
