274 

 When ^=0, equation (28A) reduces to: 



-(8/37r) sin (ai+i3)± [sin (at-}- l3)-^zY=0 

 Whence 



2=V±(8/37r) sin (at+^) -sin {at +13) (3 6 A) 



As the positive sign is apphed when {at-\-l3) is positive, and the 

 negative sign when it is negative, all of these values are real. 



The limiting values of i/B=z, for <^=0, shown in table X, are 

 derived from equation (36A). 



