820 



THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1956 



Fig. 5 — Sketch of power output as a function of L and M. 



PROJECTION IN L-M PLANE OF GRADIENT 



LINE IS G OR Arg-h,2h2, 



^21^12 



SLOPE OF PLANE ALONG G IS 



2h 



22r 



Fig. 6 — Sketch of power input as a function of L and M. 



