536 



THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1951 



2.0 



1.8 — 



1.6 — 



1.4 



1.2 



1.0 



0.8 



0.6 



0.2 



20 40 60 80 100 120 140 160 180 200 



Ic IN MICROAMPERES 



Fig. 5 — Static characteristics showing behavior at very low applied voltages and currents. 



