488 



W 



= 0.0104 at 20.4° K. 



0.00430 at 10° C. 



If 1 1.80 C. 



=r 0.0098 at 14.9° K. ') 

 Tlie temperature coefficient at 10' C. was also deteimined by 

 measurements at and 20° ('. : 

 1 dW 



Wo° c. dT 



These values point to a high degree of purity, which is certainly 

 sufficiënt for the measurements on the atomic lieat ''). 



In the measurements in hydrogen at a pressure of the bath of 

 75.2 cms, to which belongs T = 20.30, Aucs was found equal to 

 0.6932 il. According to the calibration of Febr. '15 this resistance 

 corresponds to 7'^ 20.29. The agreement between these values of 



1) Gf. also H. Kamerlingh Onnes and B. Beckman. Gomm. N". 129a, Table VII. 

 •) Gf for instance W. Meissner, Ann. d. Phys. (4) 47 (14 Sept. 1915), p. 1001. 

 [Added in tlif Iranslation]. 



