194 



PIERCE. 



where 



c = velocity of light, 



Xo= natural wavelength of the antenna without inductance, 

 X = the wavelength with the inductance, 

 ?■ = the current at the point P', 



/ = length measured along the antenna from the inductance to 

 the point P'. 



a 



FiGUKE 1. 



The character of the assumed distribution is as follows: The factor 



2irc 

 sin -T- t means that the current is sinusoidal in time at every pomt 



A 



of the antenna, with the angular velocity 



_ 27r _ 2irc _ 2tc 

 "^ ~ Y~ cT ~ X ■ 



(2) 



The meaning of the other factor 



I sin y f ^ - = J (say) 



(3) 



is illustrated in the diagrams (a), (b) and (c) of Figure 2. 



