P= W ( I +b/a tan e)+ WO. (28) becomes T h e function f (8; ..., 8, ) is now (I+k+ntanB) [1+m(sin8,-sin8)] (I + k + n tan 0, ) f ( e ; . . ., e, ) = -= 1, (29) where Whence by identical treatment we have k = WO/ W, n = b/a and m = a/L, . Lo = (a2/b) (I + k + n tan 8, ) cos3 Bo, 2n=3sinBOcos 8,(I+k+ntanO0), 8 cos3 e, 83' f -3 sin 0, (I +COS* 0,)