Constants of Metallic Oxides at Low Temperatures. 371 



V. Dielectric Constant of C cesium Hydrate (CsHO). 



(2*85 per cent, solution in water.) 



Corrected galvanometer deflection when the condenser had air as- 

 dielectric = 4*13 cm. for 100 volts. 



Mean 



Temperature galvanometer 



in platinum deflection Dielectric 



degrees. in centimetres, constant. Observations. 



-203*5 11*92 2-76 Condenser charged to 100*3 volts. 



-178-0 2-40 2-79 Condenser charged to 20-2 volts. 



-1430 3-05 3-57 



In order to examine again the influence of the solvent, we 

 tried a saturated solution of caustic potash (KHO) in e thy lie 

 alcohol. We have already shown that a 5 per cent, aqueous solution 

 of caustic potash has an enormously greater dielectric constant at 

 the temperature of liquid air than the alcoholic 5 per cent, solution. 

 And we now find that the saturated alcoholic solution of caustic 

 potash has a small dielectric value, as shown in Table VI. 



VI. Dielectric Constant of Caustic Potash (KHO) dissolved in Alcohol 



(Saturated solution.) 

 Corrected galvanometer deflection when the condenser had air as 



Observations. 

 Condenser charged to 98-2 volt? 



Charged to 18 volts. 





dielectric 



= 4-24 





Mean 





Temperature 



galvanometer 





in platinum 



deflection 



Dielectric 



degrees. 



in centimetres. 



constant. 



-194-8 



14" 55 



3-40 



-187-0 



14-85 



3-46 



-1717 



15-25 



3-57 



-159-0 



15-00 



3-50 



-146-2 



25-70 



5-97? 



We next selected for trial thallium hydrate dissolved in water, 

 with the results shown in Table VII. 



