192 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1954 



10 15 20 



NI IN ABAMPERE TURNS 



0.1 0.2 0.3 0.4 0.5 



i/nI in ABAMPERE-TURNS"' 



(a) (b) 



Fig. 2 — Graphical determination of release time. 



explicit a statement of the general relations applying as does the approxi- 

 mate analytical treatment outlined below. 



Hyperbolic Approximation to Decreasing Magnetization Curve 



The decreasing magnetization curve, as illustrated in Fig. 1, has the 

 general character of a rectangular hyperbola, and may therefore be 

 represented approximately by the empirical ec^uation : 



<P 



(R if 



(3) 



O 1400 



5 1200 



I 

 O 



A(3 



500 1000 1500 2000 2500 3000 3500 4000 



FLUX, ^, IN MAXWELLS 



Fig. 3 — Release time versus flux. 



