172 Mr. C. S. Whitehead on the Effect of a Solid 

 where /a \ 2 "+ >.(2n + l) 



tan £» = 



„ , /a\ 2 "+ x fi M^ + l) 1 



e ipt r /a \ 27i+1 



Now R i = real part of — 1 wO re — (n + l)l- J il B ' 



— nnte-^" 



= ^r- cos (p* -■?»)■ 



Again, 



dn n _ /a\ 2n+1 <MV 

 ds \ r/ rfs 



~ tfs L + n + l W J 2^a I 



+ *' (n + l)2^a\rj J' 



/ . , \ dtln 



= v» f cos <j) n + t sin n J -^j- ; 



where 



Atn(2w+1) /aV n+1 



(n + l^a (r/ 

 tan (£ n — 



1 ^{*T +1 li /*o+i) i 



n + lW J 2^a J 



""r^iW i 1 — ^a-}J 



| >n(2nfl) /ay"' 1 ] 2 

 + L^ + l)2^alr' J : 



