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ADVANCED ELECTRICITY AND MAGNETISM. 



line being open; and Figs. 183 and 184 represent voltage dis- 

 tributions over a transmission line which is connected to an 

 alternator, the distant end of the line being short-circuited. 





(O) alternator 



Fig. 182. 

 Voltage distribution over oscillating transmission line open at far end. 



The action which takes place during the building up of the 

 steady state of oscillation of the transmission line is rather 

 complicated and will not be considered. The ultimate state of 



Fig. 183. 

 Voltage distribution over oscillating transmission line closed at far end. 



steady oscillation of the line is a standing wave train of which 

 the wave-length X is equal to the distance traveled by an 

 electromagnetic wave during one complete cycle of the electro- 

 motive force of the alternator. For example, if the alternator 



