Resistance of Bismuth to Alternating Currents. 555 



the field-strength, the maximum field at my disposal having 

 been employed in the previous experiments. 



Three sets o£ experiments were made having frequencies 

 of 30, 20, and 13*3 per sec., and in each set three different 

 field-strengths were used. The results of these experiments 

 plotted according to the theory given in the previous paper 

 are shown in figs. 1, 2, and 3. In these figs, the points 



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where the straight lines cut the abscissa give the cotangents 

 of the angles of lag. In each of the figs, the straight lines 

 for the different field-strengths cut the abscissa in the same 

 point ; hence the experiments show that the angle of lag is 



2 02 



