SHUDDEMAGEN. — DEMAGNETIZING FACTORS FOR IRON RODS. 225 



in the centre. The short rods now gave the magnetization curves which 

 are merely indicated by crosses near the curves for m = 80 and in = 60 

 of Rod No. I. It is now evident which rod each of the small pieces came 

 from. Of course the magnetic induction was now measured at a distance 



TAELE XII. [Figure 14.] 



January 22, 1907. 



Diam. = 1.905 cms. = 3/4 in. Cold Rolled Shafting. 



Step Method. Long Coil. 



of about 9.5 feet in the original 20 feet rods, but still the normal curves 

 would probably not differ much. On the other hand, the normal curve 

 for Rod No. I is quite different from that for Rod No. II. 



With the help of the tracing cloth scale to be described below, Figure 

 16 was constructed, it being assumed that the maximum / is practi- 



VOL. XLIII. 



15 



