255] 



ELECTROMAGNETIC WAVES. 



549 



the relaxation-time. This may be compared with Fig. 96 showing 

 the electrostatic theory. The rise of potential at particular points, 



FIG. 99. 



as a function of the time, is shown in Fig. 100, which is the 

 analogue of the outer curve in Fig. 98. The different curves 



FIG. 100. 



are for the points at 1, 2, 3, 4 times the relaxation-distance 

 from the start. 



The potential produced by connecting the battery for a definite 

 time, and then removing it may, as before, be obtained by taking 

 the differences of two curves relatively displaced. In this way the 

 effect of the initial potential shown by the rectangle in a is shown 

 in 6, c, d, e, Fig. 101 for the times *2, *4, *6, 1*6 times the relaxation- 



