664 
Physics. — “On the Haru effect and the change in resistance in a 
magnetic field at low temperatures. V. Measurements on the 
Haut effect for alloys at the boiling point of hydrogen and 
at lower temperatures.” By H. KAMERLINGH ONNEs and Benet 
Beckman. Communication N°. 130° from the Physical Labora- 
tory at Leiden. 
VL. Gold-silver alloys. 
$ 165. In $ 12 of Comm. N°. 1297 observations on the Haut 
effect for an alloy of gold and silver (Au-Ag), with 2 atom °/, of Ag 
are published. We now give the results of our measurements on two 
Au-Ag alloys, containing greater percentages of silver. 
The alloy (Au-Ag),, coniained 10,6 atom °/, of silver’). The 
thickness of the plate was 0.049 mm. The Hatt effect was measured 
at the temperatures 7'’—= 290°, 20°,3 and 14.5° K. 
We found: 
TAB LAB ox 
The Hatt effect for (Au—Ag) 77 
f= 290 K. | T= 20° 73K. == 44,59 1K. 
H | | 
| RH _|-Rxl0t|| RH | Rx 104 | RH |—Rx104| 
UL sh AEs É | | 
8250 || 4.59 aah ih BolT Se | 3.04 3.69 
0360 | -BAT | 5.61 ole BAAI S EN BE eN eats 
10270 || 5.70 5.55 3.82 Se 3.83 3.13 
;w= 8.06x 10-4 0 || w= 4.58x 10-40 | w= 4.54x 10-470 
Ds ate 0585 2.0.58 
Wo | Wo || Wo 
The alloy (Au-Ag);;,; contained 80 atom °/, of silver. The thickness 
of the plate was 0.078 mm. 
We found: 
1) The sections of this paper are numbered in continuation of those of Comm. 
N°, 129c. (Sept. '12). 
4) The exact analysis being made now the composition is given in atom 0/0. 
