388 Profs. Fleming and Dewar. Dielectric Constants 



XV. Dielectric Constant of Potassium Bichromate (K 2 Cr 3 07). 



(5*3 per cent, (cryohydrate) solution.) 



Corrected galvanometer deflection when the condenser had air as> 

 dielectric = 4*15 cm. for 100 volts. 



Mean 



Temperature galvanometer 



in platinum deflection Dielectric 



degrees. in centimetres, constant. Observations. 



-173-0 11-15 2-50 Condenser charged to 99 volts. 



]ST.B. — The supply of liquid air on the occasion of this measurement 

 was not sufficient to lower the temperature any further than 

 — 173°, but it is clear that the dielectric constant has a low 

 value. 



XVI. Dielectric Constant of Potassium Bicarbonate (KHC0 3 ). 



(10 per cent, solution.) 



Corrected galvanometer deflection when the condenser had air as- 



4-34 cm. for 100 volts. 



Observations. 

 Condenser charged to 19'8 volts. 





dielectric 



= 4-34 





Mean 





Temperature 



galvanometer 





in platinum 



deflection 



Dielectric 



degrees. 



in centimetres. 



constant. 



-196-3 



1-90 



2-07 



-182-0 



1-93 



2-11 



-166-5 



2 50 



2-80 



-1472 



13-00 



14-70 



-134-7 



175 



27-90 



-1178 



2-60 



41-70 



Condenser charged to 1'43 volts. 



XVII. Dielectric Constant of Potassic Iodide (KI). 

 (52-17 per cent, (cryohydrate) solution.) 

 Corrected galvanometer deflection when the condenser had air as- 



dielectric = 3'44 cm. for 100 volts. 



Temperature 

 in platinum 

 degrees. 



-199-0 

 -196-0 

 -196-7 

 -191-6 

 -170-6 

 -148-0 



Mean 

 galvanometer 



deflection 

 in centimetres. 



9-65 



9-90 

 10-17 

 L2-85 



5-30 

 14-75 



Dielectric 



constant. Observations. 



2' 72 Condenser charged with 100 volta, 

 2*80 1000 ohms in series with galvano- 



2- 87 meter. 



3- 04 Charging volts = 99"8. 

 7-67 Charging volts = 19'8. 



21-60 Charging volts = 19*8. 



