﻿"Electric 
  Wind 
  from 
  a 
  Discharging 
  Point. 
  697 
  

  

  In 
  all 
  cases 
  investigated 
  the 
  result 
  obtained 
  was 
  that, 
  for 
  a 
  

   given 
  sign 
  o£ 
  discharge 
  and 
  a 
  given 
  gas, 
  z 
  is 
  inversely 
  

   proportional 
  to 
  IT, 
  the 
  atmospheric 
  pressure. 
  This 
  is 
  shown 
  

  

  clearly 
  in 
  the 
  Curves 
  III. 
  in 
  which 
  z 
  is 
  plotted 
  with 
  1/IT 
  ; 
  

   in 
  these 
  it 
  will 
  be 
  seen 
  that 
  the 
  experimental 
  points 
  for 
  air 
  lie 
  

   very 
  closely 
  on 
  a 
  straight 
  line 
  through 
  the 
  origin. 
  For 
  C0 
  2 
  

   only 
  negative 
  discharge 
  values 
  are 
  plotted 
  and 
  these, 
  though 
  

   not 
  quite 
  so 
  good, 
  seem 
  to 
  follow 
  the 
  same 
  law. 
  

  

  There 
  are 
  apparent 
  exceptions 
  however, 
  a 
  few 
  of 
  which 
  

   are 
  shown 
  in 
  the 
  Curves 
  III. 
  Thus 
  in 
  positive 
  discharge 
  in 
  

   air 
  the 
  point 
  for 
  1/11 
  = 
  '039 
  is 
  quite 
  off 
  the 
  line, 
  as 
  also 
  are 
  

   the 
  points 
  for 
  1/11 
  = 
  '072 
  and 
  1/11 
  = 
  '066 
  in 
  negative 
  dis- 
  

   charge 
  in 
  air, 
  and 
  the 
  point 
  for 
  1/11 
  = 
  '030 
  in 
  negative 
  

   discharge 
  in 
  C0 
  2 
  . 
  The 
  values 
  of 
  ~ 
  in 
  positive 
  discharge 
  in 
  

   C0 
  2 
  do 
  not 
  fit 
  on 
  a 
  line 
  at 
  all 
  and 
  were 
  exceedingly 
  irregular. 
  

   All 
  these 
  exceptions 
  are, 
  however, 
  quite 
  easily 
  explained. 
  

  

  