258 Profs. J. Dewar and J. A. Fleming. Dielectric Constants 



II. Dielectric Constant of Dry Concentrated Sulphuric Acid (H 2 S0 4 ) . 



The corrected galvanometer deflection with air as dielectric was 

 3'92 cm. for 100 volts. The switch frequency was 120. 



Mean 



Temperature galvanometer 

 in platinum deflection Dielectric 

 degrees. in centimetres, constant. Observations. 



-200*9 14-6 3-86 Condenser charged with 94*2 volts. 



-186-0 14-8 3-90 



-181-8 2-5 3-82 Condenser charged with 162 vol ts. 



-150-7 2-7 4-13 



-129-8 2-95 4-33 Condenser charged with 16'9 volts. 



— 110*0 6'0 7'25 Condenser charged with 17'0 volts. 



III. Dielectric Constant of Dry Concentrated Nitric Acid (ISTOsH). 



Corrected galvanometer deflection with air as dielectric = 3'90 cm. 



for 100 volts. 



Observations. 

 Condenser charged with 94*2 volts 





Mean 





Temperature 



galvanometer 





in platinum 



deflection 



Dielectric 



degrees. 



in centimetres. 



constant. 



-201-7 



9-05 



2-36 



-182-7 



9-27 



2-46 



-165-8 



9-25 



2-42 



-118-2 



9-40 



2-45 



-129-7 



10-00 



2-62 



Before carrying out these experiments with the concentrated nitric 

 and sulphuric acids the condenser had been carefully re-gilt and a 

 glass steady-pin substituted for the ebonite one. 



IV. Dielectric Constant of Sodium Fluoride (NaF). 



(JO per cent, solution.) 



Corrected galvanometer deflection with air as dielectric = 4 - 04 cm. 



for 100 volts. 



Mean 



Temperature galvanometer 

 in platinum deflection Dielectric 

 degrees. in centimetres, constant. Observations. 

 -199*3 9-3 2-33 Condenser charged with 94-2 volts. 



-174-2 9-3 2-35 



-149-2 10-35 2-55 

 -135-0 14-35 3-67 

 -125*0 19-6 5-05 



— 115*7 4-4 7*07 Condenser charged with 15*2 volts. 



