﻿456 Prof. Lyle and Mr. Baldwin on Propagation of 



In the series of experiments with this specimen the flux 

 density at the centre was much higher (18,000 instead of 

 10,000) than in the corresponding series with specimen A. 

 The series with rod A, given in Table II., in which the 

 induction at the centre was about 15,000, will, however, afford 

 a comparison under more nearly similar conditions, and we 

 can see that the leakage coefficients for the thinner rod are 

 considerably higher than for the other (see fig. 8). On 

 account of the smaller sectional area and greater leakage, 

 observations were of necessity limited to a shorter range than 

 for the other specimens, but within this range the phenomena 

 observed and recorded in the preceding tables are similar in 

 all respects to those observed with the previous specimens. 

 In particular the leakage coefficient again attains a 

 maximum value at or very near to the position for maximum 

 phase-lag. 



It is also worthy of notice that the value of ddjdx near 

 the origin is larger than for specimen A, the mean values of 

 the fictitious " velocity of magnetization " for the first 20 cms. 

 (a range within which in this specimen ddjdx is fairly uniform) 

 being 



2750 cms. /sec. when T = *05I5, 

 3850 cms./sec. „ T = -034, 

 5060 cms./sec. „ T = -0231, 



values considerably smaller than those for specimen A. This 



Fisy. 9. 































1 



s 



I 









































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\ 







/ / 















\ 



\ 







i 



/ 















\ 



\ 



\ 



n 



/ 



/ 



/ 







7T/z 





- cot — 





\ 



77 



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/ 



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We 



<-e fort 



ns of 



flux - 



B,atoc 



= o 



= 60 





V 



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agrees with the results of some experiments that 

 described further on, which show 



11 be 



that reducing the diameter 



