﻿4:46 Prof. Lyle and Mr. Baldwin on Propagation of 



joined (as also in figs. 4 and 5) by a continuous curve. In 

 fig. 4: against the same abscissae are plotted the retardation 

 in phase of the flux at airy point behind that of the initial 

 central flux ; while in fig. 5 the leakage coefficients at different 

 points in the several series are plotted as ordinates against 

 the logarithms of their corresponding fluxes. 



*°9f 



It will be seen that in all cases over the wide range of 

 initial fluxes used, the general nature of the phenomena is the 

 same as that exhibited by figs. 1 and 2 and detailed in 

 Tables I. -IV. Always as the flux moves away from the 

 origin its phase is at first retarded, the retardation attains a 

 maximum, and then the phase advances and keeps advancing 

 (as the rod is long) until the flux is completely dissipated. 

 The leakage coefficient also always begins by increasing, 

 attains a maximum and then diminishes ; and we found in 

 this case as in all others that the points on the rod at which 

 maximum retardation and maximum leakage coefficient 

 occurred were practically coincident. A glance at figs. 4 

 and 5 will show the effect of change of initial flux in the 

 same specimen at the same frequency on the retardations of 

 phase and the leakage coefficients. Thus increase of initial 

 flux increases the maximum retardation, diminishes the 



