761 



couples investigated approarlies to zero at lieliuintemperatures. The 

 ditTerent wires were measured against copper. After a preliminaiT 

 research, which included also the determination of the thernio- 



M 10 i3 10 SO to W So jo" 



Fig. 1. 

 electric forces of nickel and of six gold-silver alloys, the following 

 combinations were selected as most promising for investigations in 

 liqnid helium. 



i) All with 0,476 weight % ^9- 



