APPENDIX IV 443 



Now 



where (E^/^'^P) is the value of this quantity at r = Ui . In order to evaluate 

 Q we note that 



(1}C\ coCi 





A = 1' = ( I ] h 



X^Ixb) ^o'^'>'^i^^^'>'^' '>'^i^ 



(20) 



On the axis, (E/^P) has a value (E?/^P)o 



At a radius di 



(£^/^^» = (^0 (|^y f'^(7a)/5(7ai) (22) 



Hence 



