SHUDDEMAGEN. — DEMAGNETIZING FACTORS FOR IRON RODS. 239 



difference ■ between the magnetization curves for m = 300 by the 

 ballistic and magnetometric methods as observed by Benedicks and 

 published in the " Bihang," and when we consider at the same time 

 that both these curves cannot possibly be very far away from their 



TABLE XV. 



Values of N. 



limiting positions for the infinite rod. On the other hand it is quite 

 reasonable to suppose that the N for any iron ellipsoid is always 

 greater than the .A^ for the corresponding cylinder, obtained by either 

 of the two methods ; because by adding the extra mass of iron to an 



