372 Profs. J. Dewar and J. A. Fleming. On the Dielectric 



VII. Dielectric Constant of Thallium Hydrate (T1H0). 



(5*74 per cent, solution in water.) 



Corrected galvanometer deflection when the condenser had air as 

 dielectric = 4*04 cm. for 100 volts. 



Mean 



Temperature galvanometer 

 in platinum deflection 

 decrees. in centimetres. 



-203-0 

 -192-0 

 -173-0 

 -164-3 

 -148-5 

 -123-0 

 -112-8 

 -105-8 



4-82 

 10-50 

 240 

 4-10 

 6-60 



6- 85 



7- 50 



8- 30 



Dielectric 

 constant. 



6-54 

 1-43 

 41-4 

 70-7 

 114-0 

 118-0 

 130-0 

 1430 



Observations. 

 Condenser charged to 18 volts. 



Condenser charged to 1'43 volts. 



Our next experiment was made with barium hydrate, taking a 

 -5 per cent, mixture suspended in water. 



VIII. Dielectric Constant of Barium Hydrate (Ba(HO) 2 ). 

 (5 per cent, suspended in water.) 

 •Corrected galvanometer deflection when the condenser had air as 





dielectric 



= 303 



Temperature 

 in platinum 

 degrees. 



Mean 

 galvanometer 



deflection 

 in centimetres. 



Dielectric 

 constant. 



-2013 



9-00 



151 



-199-5 



10-35 



17-2 



-196-8 



11-90 



20-1 



-186-8 



12 55 



21-2 



-178-0 



14-20 



23-9 



-174-2 



111 



25-5 



-161-0 



1-40 



32-1 



-147-2 



1-60 



36-7 



-139-0 



1-71 



39-3 



-133-7 



1-82 



41-7 



-124-2 



1-95 



44-8 



-121-0 



217 



51-8 ? 



Observations. 

 Condenser charged to 19*5 volts. 



Condenser charged to 1'434 volts. 



Following on these experiments we commenced a series of measure- 

 ments on the dielectric constant of ice having suspended in it 

 various insoluble oxides. These oxides, freshly precipitated and 



