Dielectric^ Constants of certain Frozen Electrolytes. 307 



Potassic Cyanide. 

 (5 per cent, solution.) 



Temperature 

 in platinum 



-197 

 -147 

 -127 



-198 

 -156 

 -115 



Resistance in megohms, 

 greater than 250O0 

 abont 4'0 

 about 0*2 



Perchloride of Iron. 



(Saturated solution.) 



greater than 10,00O0 

 about 10,000-0 

 about 0-2 



The above figures show with what great rapidity the resistance 

 falls, when once a certain temperature is reached, which, however, is 

 far below the melting point of the frozen electrolyte. 



Further experiments were then made on chloride of sodium, hydro- 

 chloric acid, sulphuric acid, and ammonium hydrate solutions. 



Dielectric Constant of Chloride of Sodium. 



(10 per cent, solution.) 



Frequency of contact maker 120. Galvanometer deflection when 

 condenser has air as dielectric = 3*45 cm. for 100 volts. 



Observations. 

 Charging volts 20*2. 

 Charging volts 102-2. 



Temperature 







in platinum 



Galvanometer 



Dielectric 



degrees. 



deflection. 



constant. 



-198-7 



211 



2-87 



-197-8 



10-86 



2-96 



-188-8 



10-85 



3-06 



-174-2 



10-88 



2-94 



-161-3 



10-02 



2-99 



-150-2 



16-35 



4-52 



-144' 7 



21-30 



5-97 



-1417 



4-39 



615 



-136-0 



7-85 



11-10 



-129-2 



10-25 



14-55 



-124-2 



12-55 



17-85 



-118-5 



14-72 



21-20 



-114-0 



110 



22-30 



-110-2 



1-45 



29-30 



-106-6 



2-09 



43-50 



-102-0 



2-00 



40-40 



-92-2 



3-50 



65-60 ? 



Charging volts 20' 2. 



Charging volts 1*43. 



