658 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1953 



16 



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-12 



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-20 -16-12-8 -4 4 8 12 16 20 



MAGNETIC FIELD PARAMETER, $ 



Fig. 4 — Contribution to the noise change from a unit source at re = —a. 



from (^1 . ^^2) we can determine the ratio of {Jl) (Jl), for, having matched 

 the experimental curve, we know that 



c, ^^(+^) 4- (1 - c) ^^(-^) = (Jiyni+a) + {Jl)rU-a) 

 rli+a) rli-a) {Jl)^(+a) + {Jl)rl{-a) ' 



which is satisfied for all * if 



(Jl) 



(1 - Ci) _ (Jl) 



rli-a) (jDrli+a) + {Jl)rli-a) ' 



These equations are self-consistent and give 



