340 - Wave-trains through a Conducting Dielectric. 



the damped wave-train is about half as large again as for the 

 steady ray. 



Utilizing these values of yfr for calculating the intensity of 

 the reflected ray, we get the pair of curves in fig. 9. The 



Fig. 9. 



Curves showing the difference between the intensities of the portions of damped and 

 ^ undamped wave-trains reflected from an infinitely thick plate of conductivity 

 •01x10-9. 



11 



21 



31 41 51 



Dielectric constant of plate. 

 Wave-length =100 cms. X = 54 ° 44 ' 8 '"- 



61 



71 



ft=l. 



result is striking. The energy of the reflected waves for the 

 steady ray is from 15-20 p. c. of the incident energy greater 

 than for the damped ray. 



Experimental evidence for these results would be very 

 interesting ; but, so far as I am aware, there is none what- 

 ever. In cases where % was taken between 80° and 90°, the 

 alterations would be much smaller and more difficult to 

 detect. The curves I have given only illustrate, however, 

 a very small section of cases, even larger variations may be 

 possible. 



I am glad to have this opportunity of expressing my 

 indebtedness to Professor Karl Pearson, to whom my best 

 thanks are due for much advice and assistance. 



