﻿Waves of Magnetic Flux along Iron Wires. 453 



— cZF/F for the corresponding elements (and therefore X, as 

 \doc= —clF/F) would be proportional to the reluctances of 

 the second paths (partly in the materials), and thus would be 

 greater for the less permeable substance. However, as X 

 depends on the ratio of two reluctances, it is quite conceivable 

 that this ratio might be smaller for points on a rod of low 

 permeability than for the corresponding point on a rod of 

 higher permeability. (See fig. 8.) 



Piff. 8. 



120 cms 160 



Again, X at a point near the end of a finite rod for a given 

 initial flux and frequency must be greater than X for a point 

 equidistant from the magnetizing solenoid in an infinite rod 

 of the same material and cross-section ; for the reluctances 

 of the elementary leakage paths through the air will be equal, 

 while the second path for the infinite rod must have a lower 

 reluctance than that for the finite rod, seeing that iron in the 

 former takes the place of some of the circuit, which is air for 

 the latter. Thus the u end effect " on the leakage coefficient 

 is to make its value larger. 



