603 



of Comm. N°. 3*^/. For the domain sub 1, for which ?•, ^ t and thus 

 </? (?'j) = 0, the last term in the brackets of S, must be omitted. 



As to the integrations with respect to /', and r, in the domain 

 ib we must still discern between: 



and 



in the same waj in 2a between : 



«: >•. >^>r,— Ö 

 and 



In the following table the different integration limits have been 

 collected for the succeeding integrations with respect to i\, ?•,, and i\ : 



Finally we find : 



*S, = Jt* he 



— \^ T- — (1 1 +6 hi 2) f}^ f 1 6 - + öt' /;/ 



Further we have 



P. — 4.T Ac 



(23) 



(24) 



A' 1= .T» helix' In i tM- i <J' 



{ a 



Using the value of P^ found in (18) we find -. 

 (\ = ^ n'. rr' he (12 bi 2 — y) a' 

 6'j follows from 



9-. 9.. 



/7T\ '",'', ^1^'» ''ï'*» 2?' 



^3 =12 .-T'Av Lv ^ ^ + -y + -1, 



7*. r, r, r 



. (25) 

 4 -^\di\dr^dr^, 



I ' • ' 1 ' J 



