Variable Specific Heat on Gas Discharges. 591 



to a first appro mi mation 



P 



Equation (4) may therefore be written 



„ 7 1 m— 1 to— 1 



o o 



ir = 2q 



m—\ 1 



= 2^7 7j?i™Bi<j?i m — p m £ : 



/ TO-l TO-1X ^f X6 } 



1 / TO — 1 TO-1 \ 



where $ = Pi m ^i\pi. m +p m ). 



U 2 = 2q i P\ m VA'Pi m — p 



1 m — Y £ 



a m 1 ( ~=* 5=?\ 



TO-l J 



f X/ </> jo ™ jt?i w ri\"\ to a first 

 L R\2m~" m /J approximation 



ty n „_i Pi mv i\pi m —p m ) 



m 



.•. u 2 =u c 2 < l+o^ — \1 — # TO / S* to a first approximation, 



*" "XT / to-i\-^ 

 ,=^ L l+^(l-.^-)j_ (6) 



i. e. 



