210 



ADVANCED ELECTRICITY AND MAGNETISM. 



h; X e. Such a wave we will call a ribbon wave. Thus Fig. 

 145 represents a ribbon wave d/F seconds after the battery is 



d 



wire 



ribbon wave 



Fig. 145. 



Showing the ribbon wave which shoots out from a battery which is suddenly 

 connected to the end of a line. 



connected. The short horizontal arrows represent current, the 



fine vertical lines represent the lines of force of the electric field, 



and dots represent magnetic lines of force as in Figs. 141 and 144. 



The rectangular wave pulse. Figure 146 represents the iso- 



current 



Fig. 146. 

 A rectangular electromagnetic wave pulse. 



lated wave pulse which is produced when a battery of negligible 

 resistance is connected across the end of the line for a moment 

 and then disconnected. Theordinate y of the curve WW repre- 

 sents the voltage e or the current i at each point on the line, 

 and the wave pulse is called a rectangular wave pulse because 

 this curve WW is a rectangle. 



