ELECTRIC CIRCUIT THEORY 



77 



Curves (16), (17) and (18) illustrate the voltage wave for several 

 conditions. After the arrival of the head, the wave slowly builds 

 up to its final value. Curve (18) represents the case where the line 

 is very nearly distortionless, showing how completely the distorting 

 tail of the wave is eliminated. 



160 



200 



220 240 260 280 300 320 540 



Fig. 15 — Propagated current in line; .t = 200 



360 



380 



2 ^ L^ 2^ C 



0.0353 



Multiply ordinates by -^ C/L.e~''-^^ 



7? / /^ 

 Fig. 16— Propagated voltage in line; y \y- :t: = ax = 3 ; G = 0. 



So far we have confined attention to the current and voltage waves 

 in response to a unit e.m.f. applied at time / = to the line terminals. 

 Of much greater technical importance is the question of the waves 

 m response to a sinusoidal e.m.f. suddenly applied to the line termi- 



