Coefficient of End- Correction, 253 



Now 1 = P , 



c«!(p,+ ip.) 



hi 16 /t> _l 9 P a. 55 P J . 33 p'l 

 ^ = 23ll P6+ 2 P4+ ^ P2+ l6 Po > 



But 



&„Po + J 2 P 2 + * 4 P* + i 6 P« = A + Bf» + Of + Df 6 



Then 6 =A+|B+-gC+jD, 



% 



10 



3" '21 



5 s= - B +?C+£D, 



>.= 2 > 



and £=A+Jb + Jc+^D by(ii.) 



so that tt-^Ix^o. 2 pj_ 3 n 



The potential V at the end z= — L is /L + E and is assumed 

 to be fixed. 



Then *( L +x) + ! B +I5 C +2S D isfixed - ■ (™0 

 In the region I. at the boundary -S7 2 + ~ 2 = R 2 , the potential 



V is proportional to tj and ~ — to fjo , so that the integral 



J-\-y 1\ on It 



V^— d& can be made as small as we please by increasing 



R sufficiently. 



