CURRENTS IN INFINITE PLATES AND SPHERICAL SHELLS. 
353 
where 
UP 3 
dr 
— — 477 $ 
(2w+l)-=47rE 
cl 
(41) 
<P=S(Ee^P/). 
But P n being P„* at the surface of the sheet, equations (40) give 
and therefore 
C 
RE= ~(omi( C+$t), 
47r&ma. 
2n +1 
*.( c+a) 
(42) 
the same result as obtained in the previous article. 
