CONTACT PHENOMENA IN TELEPHONE SWITCHING CIRCUITS 51 



10 20 



MICROSECONDS 



Fig. 10 — Evidence of point discharge, current. 



20 30 



MICROSECONDS 



Fig. 11 — Early part of "B" transient, voltage. 



6 



4 



lU 2 



a 

 ui 



< 2 



4 

 6 



20 30 



MICROSECONDS 



Fig. 12 — Early part of "B" transient, current. 



