Figure 3 represents the B-H curves for four lengths of the same material, 

 (experiment B). The curves OP, OQ, OR, and OS correspond to specimens of 

 lengths 150, 60, 40, and 20 cms. respectively, plotted on an arbitrary scale. 

 One unit on the Y axes corresponds to a B of 6000 gausses; and one unit on 

 the X axes to a field H of 12.17 gausses. 



EXCITING FIELD 



200 H 



Figure 4 shows the B-H curves for two of the specimens used in experiment 

 C. These curves OA and OE are plotted from Table V, for m = 164 and 

 m = 24. 



