656 



THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1953 



When only the surface x = +a is emitting, we set Xq = +a in (10) 

 and get 



= fe(^ + -) 



-$> 



1 - «2 - (1 - e-") 



«1 + "26 



2o^ 



I>V'i «! + die* 



Similarly, when only — o is emitting, we get 



1 



2 «i 



THi-a) 



^ 



2a 



Z)^2 a\e * + 0:2 



- 1 



But in an actual experiment, both faces will be emitting, with mean 

 square strengths (Ji), (J2) say. The quantity that is then measured 



•? 



§-. 



8 

 5 • 



Z 



5-2 



-» 



■20 



■le 



•12 



16 20 



-e -4 4 6 



MAGNETIC FIELD PARAMETER, 4> 



Fig. 3 — Contribution to the noise change from a unit source at the plane 

 X — +0. 



