88 Mr. E. Howard Smart on a Formula for 



The formula reduces in this case to 



^< + D>'--'{^K$'-^)V 



or 



-~,(©. + © 2 )]+^V(® 1 + ® 2 ) 2 - 

 The first term gives the previous approximation. Dealing 



with the second the coefficient of r,y 4 v 2 is 



o 



«.{i^.e-D(^ + ^)-K'-')} 



Since /x _ //. — 1 1 yu, — 1 1 



^ \r 5 / ~~ \r w/ \5 « / 



this may be written 



t J V-/. + 3 [ 3 M 2 + /u -6 3Q 2 -1) 1 

 /* 2 L ? i2 ^w w' 2 J 



[ © 2 J ^-^ + 3 3/x 2 + ^u-6 3Q» 2 -1) \ 



/Jb 2 L 5 2 SI? V 2 J 



20 2 J V + 2/X-3 __ 4^ + 2^1-6 3 (a 2 -l) \ 

 + > 9 1 s 2 «« + " v 2 J** 



