of Frozen Electrolytes at very Low temperatures. 38& 



IV. Dielectric Constant of Sodic Biborate {Borax), Na 3 O2B2O3,10H 2 O. 



(15 per cent, solution.) 



Corrected galvanometer deflection when the condenser had air as 

 dielectric = 4*24 cm. for 100 volts. 



Temperature 

 in platinum 



-202-0 

 -195-3 

 -188-4 

 -176-0 

 -152-7 

 -139-8 

 -1270 

 -121-0 

 -112-8 



Mean 

 galvanometer 



deflection 

 in centimetres. 

 2-40 

 4-10 



4- 85 

 525 



5- 50 



5- 85 



6- 40 



6- 30 



7- 35 



Dielectric 

 constant. 



39-4 

 67-2 

 79-5 

 86-3 

 90-5 

 96-0 

 105-0 

 103-0 

 118-0 



Observations. 

 Condenser charged to 1'434 volts. 



N\B. — Condenser warmed up in the vacuum tube. 



V. Dielectric Constant of Sodic Nitrite (NaNOz). 



(JO per cent, solution.) 



Corrected galvanometer deflection when the condenser had air as 

 dielectric = 4*15 cm. for 100 volts. 



Observations. 

 Condenser charged to 98*8 volts. 

 Condenser charged to 19-8 volts. 

 Condenser charged to 19'8 volts. 

 Condenser charged to 1-434 volts.. 

 Condenser charged to 1'434 volts. 





Mean 





Temperature 



galvanometer 





in platinum 



deflection 



Dielectric 



degrees. 



in centimetres. 



constant. 



-200-0 



11-80 



2-78 



-172-7 



2-35 



2-77 



-130-3 



13-50 



16-30 



-120-3 



2-35 



39-00 



-98-2 



3-40 



57-00 



