TEMPERATURE COEFFICIENT OF ICE. JOHNSTONE. 



129 





FIG. 3. 



circuit, the resistance of the sample of ice was calculated from 

 these data, and from this, the specific resistance of the ice. 

 This was done for several temperatures. 



A great difficulty was encountered in determining the 

 actual value of the current passing through the ice. Ayrton 

 and Perry were troubled greatly by polarization effects which, 

 at that time, they were unable to determine the nature of. As 

 they could not eliminate this effect, which will be shown to be 



