PROPAGATION OF PERIODIC CURRENTS 



Y'dFO 

 Y dx 



523 



L X Y' dF(x)L 



Positive 

 directions 



FI6.7(SET2) 



f(x)+(<4) 



dF(x) 



dx 



dx 



"Y'^Wnr -r T-FM X-F(x*dx) X -f-Y^^^) 



Ydx 5 Ydx ^Ydx ^Ydx 



FI6.8(SET4) 



//////0/////Z 



x.dx //////////// ^ ///// 



FI6.9(SET3) 



f'Cx)dx 



(^X)f(0) 



J^^Adfwv]^J^[^^M^v^^I^hA^^|^^^J^[^VHfvv^^|J^ 



(.^]r« 



:Ydx ^Ydx ^Ydx |Ydx |Ydx ^Ydx <Z. 



//////^///////// X -'''-' 



/ / // a / / , 



FIG. 10 



(♦-^>(0) 



J^ww\A^v^^vvv^^/v^Q;VvAA^AA/X^^Mpw^/3A'^^^^Ay^^ 



Ydx ^Ydx ^Ydx ^Ydx e Ydx ^Yd^ 



e^>(^) 



/////A///////// A////// a ///////////////// s ///// 



FI6.il (SET 6) 



