556 Mr. G. C. Simpson on the Electrical 



independent of field-strength. Thus the curve already given 

 connecting angle of lag with frequency holds for all rield- 

 s trengths. 



Fig. 3. 











































































































cs 

































F 



REC 



HEN 



CY 



13-3 





























1^ 





















020 























v^> 





















r 

 R 















































015 





































































\30<l 



















■010 

























































































'005 







^ 















H 



= 6.8UU 































5 



























6 



2 



' 







•1 



■2 



■5 



■4 



■5 



6 



•7 



•8 



■9 10 1 



I 12 1 

 i 



3 



II. The variation of the magnitude of the bismuth E.M.F. 

 with different field-strengths, frequency constant, was calculated 

 from the results obtained in the above determination. 



These results, with a few more from separate experiments, 



Fig. 4. 



•0?0 



•005 













































































r s s 



^ 



































<<*■ 



# 









U|U1 





































^ 



^- 



UJ 































f' 





^ 



|# 





h 























ox 











J0> 



^>- 







5 









































m 

























































































> 



u 



^ 



Fl 



:ld 



STR 



£NG 



"H 



















16 17 18 I9*I0 3 



are plotted in fig. 4, in which the value of the bismuth E.M.F. 



e 



™, is plotted against field-strength. The conclusions to be 



drawn from this fig. are very interesting, showing as they do: 

 1st, that the magnitude of the bismuth E.M.F. is a linear 

 function of the field-strength ; 2nd, that the bismuth E.M.F. 

 is zero at the same field-strength for all frequencies ; and 



