﻿Waves of Magnetic Flux aloiuj Iron Wires. 463 



One series of experiments was performed with each of d\ 

 and d 2 under approximately the same conditions of frequency 

 and initial flux-density as the series already performed on D 

 and recorded in Table XXI. 



In Tables XXIII. and XXIV. are given the results of the new 

 series, and it will be seen on comparing them with Table XXI. 

 and with each other, that the effect of change of diameter is if 

 anything more marked than that of permeability which was 

 illustrated by the comparative series on specimens A and B. 



Thus we find that the values of dOjdx near the origin for 

 the diameters 4, 2, and 1, are 475, 9*9, and 15*3 respectively; 

 so that if we deduced a " velocity " from these figures we 

 should get very different values for it, in the same material, 

 with the same frequency and flux-density. 



The change of diameter seems to have little or no effect on 

 the max. value of the retardation, though it has a marked 

 effect on the distance from the origin at which this maximum 

 occurs. Thus the coincident points of max. retardation and 



max. leakage coefficient are at distances from the magnetizing 



. . . 



solenoid approximately proportional to the diameters of the 



specimens in which they occur. 



Again we find that reduction of diameter increases the 



leakage coefficients (for the same conditions of frequency and 



flux-denshrv) approximately in the same ratio as the diameter 



is reduced. 



Table XXIII. — 46 wires from Specimen D. 

 T=-050. 



C='0742[sin ut- 042 sin 3(W +028)+ -0035 sin 5(w*-66)]. 

 T=/j sin (arf-e)+/ 3 sin3(<o*-e-j3 3 )+/ g sin 5(ojt-0-^, ). 



0. 

 10. 

 20. 

 25. 

 30. 

 40. 

 50. 

 60. 



/, 



/ 3 //l 



fjfv 



2583 -0603 



•0095 



1096 



1113 



•0158 



3366 



•1530 



•0302 



158*3 



•1630 



•0345 



71-3 



•1583 



•0374 



150 



•1400 



•0321 



476 -1214 



•0225 



2-32 -1033 



•0205 



1 



&• & 



17-09 

 7-07 

 559 

 483 

 5-69 

 8-44 

 1037 

 10-45 



2524 



1475 



976 



893 



9 35 



13-64 



18-80 



1994 



e x -fi 







9-91 

 1709 

 19-13 

 18-54 

 16-S6 

 13-82 

 11-60 



0857 

 •1181 

 •1508 

 •1596 

 •1559 

 •1147 

 •0742 



