1903.] 



Dielectric Properties of Solid Glycerine. 



243 



the conductivity falls and then rises, as the temperature is varied from 

 + 13° to - 59° C. when freezing from the liquid to the solid state. An 

 analogous effect has been observed in soda-lime glass.* 



When the time of contact is 0-006 second, all the points in the table 

 lie well on the same curve between -26° and -81° C. It is when 

 freezing from the liquid to the solid states that such serious changes 

 occur at the short times. 



Time of 





Conductivity in 10" 



" 6 ohms -1 







contact in 

 seconds 

 after 

 application 



Freezing from liquid to 

 solid state. 



Freezing from solid state. 



1 of force. 



• 



i 



+ 13° C. 



-26° C. 



-59° C. 



+ 12° C. 



-48° C. 



-75° C. 



-81° C. 



i 



-00002 

 -00017 

 -00035 

 -00099 

 0028 

 0-0060 

 -0090 

 0-011 

 0-018 



15 

 1*5 



1 -72 

 o'-67 



8'03 



0-172 

 -0708 

 0481 

 -0319 

 0-0287 

 -0249 

 -0160 



Curve 

 No. 1 



4-63 

 4-63 



0-388 

 0-13,4 



0-191 

 -012 



-197 

 -0301 

 0201 

 0-0120 

 0109 

 -00926 



Curve 

 No. 2 i 



* Hopkinson and Wilson, 'Phil. Trans.,' A, vol. 189 (1897), pp. 109—136. 



