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PROCEEDINGS OF THE AMERICAN ACADEMY. 



cally reached when B= 17,000. This body of iV-curves shows the 

 curvatures which we were led to expect, and also the tremendous turn to 

 the left as the curves get near the point of complete saturation. This 

 curve might be said to embody the most important results obtained 

 about the xV-curves. The one corresponding to m = 20, after going 



10 15 



Figure 13. [Taisle XL] 



20 



S5 



Step magnetization curves in long coil for a Bessemer soft steel rod of diam- 

 eter 1.111 cms. 



out nearly straight far beyond the limits of the figure, sweeps back to 

 the left and just shows in the upper left-hand corner. It will be noticed 

 that the points of observation for all the curves become uncertain after 

 B = 12,000; this is to be expected because the magnetization curves 

 there become almost horizontal and run into one another, and the find- 

 ing of the abscissa-differences is a very difficult matter. 



