342 Mr. R, H. M. Bosanquet on Electromagnets. 



Fig. 1, 



Conductivity^. 





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2,500 













Rowland's Table No.l. 



























































































































































" r " 































2,000 











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100- 



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1,000 



5,000 



Magnetic Coxdue&ggfy of Ban 



Fig. 2. 



r-so wim 



i pole pieces 



Conductivity^ 



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 200 





























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100 







5. 



WO 









w. 



900 









15, 



100 









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00 



