Constants of Pure Ice, #<?., at Low Temperatures. 319 



The results of these observations are set out in the curve in 

 fig. 1 marked pure water. 



120* 









i 



too* 







h 







20* 



fANTS. 





Is 



I ^ 







D CONS* 





r 



/ ° 



/ A 







lLECTRK 



v J 



^ 







Q 



/ 



V 



I \ 



/ / * 



ft- 



















-200° -150° -lOO -50° 0° 



TEMPERATURE IN PLATINUM DEGREES. 



Fig. 1. Curves showing the variation of dielectric constant of ice and frozen 



glycerine with temperature. 



It will be seen from the form of this curve that the dielectric 

 constant of the pure ice would be evidently represented by a 

 number not far from 80 at the temperature of the melting point of 

 ice. 



We determined also the electrical resistance of this ice condenser 

 during the time it was very slowly warming up to the temperature 

 of the room, a process which, occupied about six hours. 



