208 



ELECTRICAL MEASUREMENTS 



20 40 60 80 100 



Sparking Distance in Millimeters 



30 60 90 120 150 



Sparking Distance In Millimeters 



50 100 150 200 250 

 Sparking Distance in Millimeters 



50 100 150 200 250 

 Sparking Distance in Millimeters 



FIG. 152. Plots of A. I. E. E. table for spark gap with spherical electrodes. 



