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BELL SYSTEM TECHNICAL JOURNAL 



250 200 150 100 5i 

 H IN OERSTEDS 



DEVELOPED LENGTH OF SPECIMEN IN INCHES 



Fig. 8 — Comparison of Brem vs. length curves for straight bar and 2-in. I.D. ring 

 of J^-in. X M-in. cobalt steel in which Br = 9,980 gauss and He = 230 oersteds. 



effect on the value of Bre,n, causing the curve for Bre,n vs. length to 

 turn upwards for those lengths corresponding to short air gaps. 



Additional data along these lines would be very useful, and should 

 include measurements on magnets with pole structures having well 

 defined air gaps. 



100 80 60 40 20 

 H IN OERSTEDS 



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DEVELOPED LENGTH OF SPECIMEN IN INCHES 



Fig. 9 — Comparison of Brem vs. length curves for straight bar and 2-in. I.D. ring 

 of ^-in. X M-in- tungsten steel in which Br = 10,830 gauss and He = 59 oersteds. 



