993 
instance, an admixture of 2 atomie percentages of gold reduces the 
_ conductivity (expressed in the above measure) from 71.10 >< 10° to 
ce hie 
mp 
| 
Se 10° 
OS ae Zj) 
Jem 
a0 20 40 00 80 100 
amp tom 3 Tey 
Fig. 1. 
~ - 4 OT w 
1.35 X 10°. The curves expressing the temperature quotient — —=— 
oO wT 
0 
as a function of the atomic percentage follow a similar course. The 
researches of KAMERLINGH Onnes and Cray‘) on various gold wires 
have shown that the degree of purity of a metal can be very 
0 <0 20 é9 70 8 9 100 
mans Alom 4 ca med ds A 
Fig. 2 and 3, 
1) See note 3 p. 991, 
