ipll.] 



WHITEHEAD— HIGH \'OLTAGE CORONA IX AIR. 



379 



TABLE II. 



face invariably lowers the critical intensity. The corresponding 

 point falls below the curve of Fig. 2. 



The closeness with which this simple law is followed by the 

 measurements suggest a considerable value of the method for a 



80 



o 



uj 5C 



o ;o 



12 3 4 5 6 



DIAMETER MILLIMETERS 



Fig. 2. Relation of critical intensity and diameter. 



