663 
J. Kornicspercer and J. Werss *) to obtain the variation of the electron 
density (N) from the temperature coefficient of the Harz effect. From 
this relation it should follow that the density of the electrons in Au, 
Ag, Cu, Pd varies very slowly with the temperature, much more 
slowly than VV 7’. 
lll. Alloys. 
§ 9. Gold-silver. The alloys investigated contained 2°/, of silver 
by volume. 
TABLE XV. 
HALL effect for a gold alloy. 
T = 290° K. T = 90° K. 
H eeen a ae ee ae te ee ST 
RH — Rx 104 RH —Rx 104 
8250 || 5.58 GTi lt 225.40 6.54 
9065 6.18 6.82 6.01 6.63 
9760 6.61 Gell he 16.44 6.59 
10270 6.94 6.76 6.86 6.67 
0 Wogge = 3.81 x 10-4 O | Wyo = 1.77x10—4 0 
Hence the mean value of Ff is for | 
FIK i Gea Se 108 
90° 0:61 
The hydrogen experiments gave *) for 
Wad Keck 0 0U 05E 
fi EA) R= 6.48 
Hence the Hat. coefficient for this alloy is almost constant; on 
proceeding to low temperatures it begins to exhibit a slight decrease. 
1, J. KOENIGSBERGER and J. Weiss, Ann. d. Phys. 35. 1. 1911, 
_ 2) H. KAMERLINGH ONNES and Benet BECKMAN, |. Cc. 
