DIP^HJACTIOX OF KADIO W AVK8 BY A PAKABULIC CYLINDKR 429 



DISTANCE BELOW CREST h-L) 



Fig. 2.4 — • The surface current densit}' is plotted as a function of the vertical 

 distance below the crest or edge. The curves for h = 1000 and h = are obtained 

 from Table 2.2 and equations (2.20), respectivel}'. Here, as alwaj^s, the units are 

 such at X = 27r = 6.28 . . . 



The equations used to compute the curves marked /i = are 



U-J = (iTrr)' 



-1/2 



+ 2^> 





-it^ 



(It 



./„ = 2(z77r)^'- r c-''\H, 



(2.20) 



where the upper signs are for the shadow side and the lower ones for 

 the ilKiminated side. The computations arc made easier bj^ the relations 



(roJ)- - ao./)+ = 2, 



(J.)_ + (/,)+ = 2, 



