220 



i THE. ' N A! \. 



that for the rod of same diameter worked out beginning od < >otober9. 

 It will be noticed that these values for 2Vare considerably larger than 

 those of the earlier series. This again Bhows very clearly the difference 

 between the reversal and the step method 



TABLE Vlli. [Kigikk 11.] 



A - 16, 1906. 



Diafia. =0.3175 cm. = 1/8 in. 



R] '. BRSALS. 



Figure 13 gives the experimental curves corresponding to Table XI, 

 January 18, 1907. They wen' taken by the step method, and each 

 curve was based on three or four separate magnetizations from zero to the 

 highest value of //'. bo that good average results might be obtained. 

 It will be noticed that the curve for m = 200 passes very nearly 

 through two sets of observations, but that on either side of it lie 



