of Frozen Electrolytes at very Low Temperatures. 391 



XXIII. Dielectric Constant of Plumbic Nitrate, Pb(N0 3 ) 2 . 



(10 per cent, solution.) 



Corrected galvanometer deflection when the condenser had air as 

 dielectric = 4*24 cm. for 100 volts. 



Temperature 

 in platinum 

 degrees. 

 -200-2 

 -144-4 

 -1320 



Mean 

 galvanometer 



deflection 

 in centimetres. 



1312 

 2-75 

 5*10 



Dielectric 



constant. Observations. 



3-03 Charged to 987 volts. 

 45*20 Charged to 1-434 volts. 

 83-70 



-200° -!50° -t00° -50° , r 



Fig. 1. — Curves showing the Variation in Dielectric Constant with Temperature 



of various Frozen Electrolytes. 



2 e 2 



