Dielectric Constants of certain Frozen Electrolytes. 309 



Ammonium Hydrate. 

 l/100tli of gram molecule to the litre. 

 Electrical resistance of condenser. 

 Temperature 



in platinum Resistance of condenser 



degrees. in megohms. 



-198 greater than 50,000 



-140 about 91 



In the next place solutions of mineral acids were tried, taking 

 sulphuric acid and hydrochloric acid as typical, and operating with 

 them as above when frozen as the dielectric of the condenser. 



Dielftctric Constant of Dilute Sulphuric Acid. 

 (10 per cent, solution.) 



Frequency of contact maker 120. Galvanometer deflection with air 

 as dielectric = 3*45 cm. for 100 volts. 



Observations. 

 Charging volts 20' 1. 



Temperature 



Galvanometer 





in platinum 



deflection 



Dielectric 



degrees. 



in centimetres. 



constant. 



-2022 



2-86 



4-11 



-197-8 



2-84 



4-07 



-197-5 



2-84 



407 



-190-0 



2-87 



4-14 



-169-8 



3-00 



4-21 



-158-0 



4-05 



572 



-146-8 



630 



' 9-00 



-142-8 



8-48 



12-12 ? 



Dielectric Constant of Dilute Hydrochloric Acid. 



1/ 100th of gram molecule to the litre. 



Galvanometer deflection with air as dielectric = 2'60 cm. for 

 100 volts. 



Charging volts 100*8. 



-198-0 

 -1962 

 -194-3 

 -176-2 



6-96 

 6-96 

 6'96 

 8-20 



2-46 

 2-46 

 2-46 

 2-94 



The curves representing the dielectric constants of sulphuric and 

 hydrochloric acids and dilute ammonia are given in fig. 4, which 

 contains some other curves as well. 



In the case of this dilute hydrochloric acid, the resistance of the 

 condenser at —198° was greater than 50,000 megohms, and at 



