486 



^ 2. Heat ctijntcifi/ of tlw core Km. Willi a view lo Hie irrogii- 

 larities wliicli had occurred in tlie measurements of 1914 (Comm. 

 N°. 143 § 4) this heat capacity was determined once more. In these 

 measurements at a pressure of 75. (! cms. of the hydrogen batli, 

 which corresponds to 7'= 20.31, ir.i,,,^ was found equal loü. 6940 .ii, 

 whereas according to the calibration of Kebr. 27, '15 tlii.s resistance 

 corresponds to 7"= 20.34. The difference between these two values 

 of T corresponds to a displacement of the curve, which represents 

 the heat capacity of Km as a function of tlie temperature to an 

 amount of 0.3 7o of t'le heat capacity at 15° K., and to an appre- 

 ciably smaller amount at 20° K. As (his is far within the limit ot 

 accuracy reached in the measurements the calibrations of 25/27 Febr. 

 '15 could be used for the calcidation of the temperatures. 



The heal capacity appears to be a little smaller in the region 

 ol the liquid hydrogen temperatures in these measurements than at 



