

PROCEEDINGS OF THE AMERICAN ACADEMY. 



cally reached when />' = 17,000. This body of ^-curves Bhowa the 

 curvature- which we were led to expect) pud also the tremendous turn to 

 the left as the curves ,u r et near the point of complete saturation. This 

 curve might be aaid to embody the most important results obtained 

 about the ^-curves. The one correspond in;: to nt = 'Jo, after going 



10 16 



Fig ike !•'!. [Table XI 



20 



26 



Step magnetization curves in long coil for :i Beset mer Bofl Bteel rod of diam- 

 eter 1.111 cms. 



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

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

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

 />' = 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. 



