444 



BELL] SYSTEM TECHNICAL JOURNAL 



I — v^A^ — ^1 — nm~^ 



C2 



© 



, ^2 



I| J (NON 



LINEAR)' 



i2 e^2 



lL2 



(A) 



-pt 



Fig. 6 — Diagrams illustrating operation of the harmonic generator. {A ) Harmonic 

 generator circuit; (B) Differential inductance and flux density of assumed non-linear 

 coil as functions of magnetizing force; (C) Variation with time of currents in primary 

 and secondary meshes, and in non-linear coil; (D) (E) (F) Equivalent circuits of the 

 harmonic generator for the three time intervals indicated. 



corresponding to the magnetizing forces ± Ho. With this simple 

 representation of the non-Unear inductance, the operation of the circuit 

 shown in Fig. 6a will be described over a complete cycle of the funda- 

 mental input wave. 



The current flowing in the input mesh is made practically sinusoidal 

 by tuning Z-i, Ci. If now we start at the negative peak of the sinus- 

 oidal input current of amplitude /i and frequency p/lw, the non-linear 



