Constants of Metallic Oxides at Loiv Temperatures. 373 



washed, were suspended in distilled water, and, being well shaken 

 up, were introduced into the condenser and frozen. The results are 

 given iu the tables below, beginning with aluminic oxide. 



IX. Dielectric Constant of Aluminic Sesquioxide (A1 2 3 ). 



(Suspended in water.) 



Corrected galvanometer deflection when the condenser had air as 

 dielectric = 3*97 cm. for 100 volts. 



Observations. 

 Condenser charged to 18*0 volts. 





Mean 





Temperature 



galvanometer 





in platinum 



deflection 



Dielectric 



degrees. 



in centimetres. 



constant. 



-205-7 



1-92 



2-58 



-190-0 



1-89 



253 



-1598 



1-92 



2-58 



-1327 



3-25 



4-43 



X. Dielectric Constant of Oxide of Iron (Fe 2 3 ). 



(Suspended in water.) 



(12*6 per cent, of oxide.) 



Corrected galvanometer deflection when the condenser had air as 

 dielectric = 4'07 cm. for 100 volts. 



Observations. 

 Condenser charged to 1*434 volts. 



Temperature 

 in platinum 

 degrees. 



Mean 

 galvanometer 

 deflection 

 in centimetres. 



Dielectric 

 constant. 



-199-4 



5-2 



89-8 



-191-7 



63 



112-0 



-180-0 



6-8 



121-0 



-165-4 



7-0 



124-0 



-1538 



7-2 



128-0 



-143-7 



7-75 



134-0 



-136-8 



7-8 



135-0 



-128-7 



8-05 



1390 



-123-2 



8-75 



151-0 ? 



-118-0 



103 



176-0? 



VOL. LXI. 



