452 



ctq' 



1^ 



2R 

 For sufüciently small values of -:- the formula reduces to 



dp 1 p ■ P\ i y^\ 



— = — .— or after mtegration — = 1 / — 

 dT 2 T ^ 2\ V ^\ 



The limit for the application of formula // has been taken at 

 — = 1, which gives about the same accuracy as in the former case. 



dp 



The relation between p and - according to formnla // is also 

 given in fig. 3. 



