1410 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1953 



ampere turns in an auxiliary coil. The equivalent of such a bias would 

 be obtained by decreasing the strength of the A^ magnet and increasing 

 the strength of the S magnet, each by the value B. The general magnet 

 strength values would then be 



Mn = Mn, - B, 



Ms = Msi + B. 



(8) 



Combining equations (5), (6), (7) and (8) to eliminate Mcsi , Mcni , 

 Mni , Msi and B, we obtain the general relations between sensitivity 

 and magnet strength as 





- M, 



2 



- M„ 



(9) 

 (10) 



160 



120 



5 60 



m 



cr. 



lU 40 



Q. 



< 



20 



-40 



-60 



10 



01 2345678" 



ADJUSTMENT SEQUENCE 



Fig. 13 — Sequence of sensitivity values obtained in adjustment. 



