TABLE 3 

 Effect of Various Types of Rings for Confining Mercury Electrode 



Without ring 



With metal ring ^/fg in. high, outside bevel 



With square edged hard rubber ring 



With bevel edged hard rubber ring 



With flat phenol fibre ring 



TABLE 4 

 Power Factors as Measured with Different Electrodes 



* Not measured. 



TABLE 5 

 Measurements on 14 In. Phenol Fibre with Electrodes of Various Sizes 



Note: Sample was 6 in. square mth lower electrode covering entire lower surface. 



572c 



