818 SUMMARY OP CURRENT RESEARCHES RELATING TO 



then 



from which 



With the liquid used for comparison the equation becomes 



i 1 _ n' - 1 

 2>" p~ V 

 whence 



r = w' — 1 



1 1 

 P" ~ V 

 By substituting the value of r in the equation a we get 



n = 1 -}-(»*' — 



■'(a(^? 



1 1 



„ = 1 _i_ (n' _ 1) ? "i . 



-TV '' 1 1 



P V 

 But 



1 1 p — p' 



7' ~p _ ^5Z = -^-'-^^ Cp - v') ^ v" (p - p') ^ ^" p -p' 



\__\~ !>_- P^ P p'Xp - P") P' (.P ~ P") P P - p" 

 p" p p" p 

 then 



n= i + (^'_l)^'^J:4...y3'. 

 ^ ^ p p—p 



By substituting for pp'p" their values in functions of gg'g", and 

 remembering that 



