﻿Wellisch 
  and 
  Woodrow 
  — 
  Columnar 
  Ionization. 
  223 
  

  

  given 
  curves 
  which 
  show 
  how 
  i/I 
  varies 
  with 
  I 
  for 
  different 
  

   values 
  of 
  X 
  in 
  the 
  longitudinal 
  field. 
  The 
  curves 
  are 
  plotted 
  

   from 
  the 
  values 
  given 
  in 
  Table 
  YII. 
  These 
  corves 
  are 
  pro- 
  

   duced 
  so 
  as 
  to 
  intersect 
  the 
  axis 
  of 
  ordinates 
  : 
  the 
  ordinates 
  

   thus 
  cut 
  off 
  represent 
  the 
  fraction 
  of 
  the 
  saturation 
  current 
  

  

  Fig. 
  4. 
  

  

  .3 
  

  

  .9 
  1.2 
  1.5 
  1.8 
  2.1 
  2.4 
  

  

  Saturation 
  Current 
  I. 
  

  

  which 
  would 
  be 
  obtained 
  by 
  the 
  corresponding 
  field 
  in. 
  the 
  

   absence 
  of 
  any 
  recombination 
  between 
  ions 
  of 
  different 
  

   columns. 
  

  

  It 
  might 
  be 
  expected 
  that 
  as 
  there 
  are 
  only 
  four 
  points 
  on 
  

   each 
  curve 
  it 
  would 
  be 
  very 
  difficult 
  to 
  produce 
  the 
  curves 
  as 
  

  

  Table 
  VII. 
  

   Longitudinal 
  Field 
  ; 
  d=2*6 
  cm.; 
  p='7Q0 
  mm. 
  

  

  X. 
  

  

  0-4 
  

  

  1-0 
  

  

  2-0 
  

  

  4-0 
  

  

  10 
  

  

  25 
  

  

  105 
  

  

  420 
  

  

  I. 
  

  

  ill. 
  

  

  •36 
  

  

  •52 
  

  

  •605 
  

  

  •658 
  

  

  •'710 
  

  

  •76 
  

  

  •86 
  

  

  •94 
  

  

  0-12 
  

  

  ill. 
  

  

  •33 
  

  

  •50 
  

  

  •595 
  

  

  •654 
  

  

  •708 
  

  

  •76 
  

  

  •86 
  

  

  

  0-13 
  

  

  ill. 
  

  

  •19 
  

  

  •34 
  

  

  •548 
  

  

  •635 
  

  

  •704 
  

  

  •76 
  

  

  •86 
  

  

  •96 
  

  

  0-78 
  

  

  ill. 
  

  

  •15 
  

  

  •29 
  

  

  •498 
  

  

  •623 
  

  

  •704 
  

  

  •76 
  

  

  •86 
  

  

  •94 
  

  

  2'39 
  

  

  Transverse 
  Field 
  ; 
  d 
  = 
  2*6 
  cm.; 
  jp=760 
  mm. 
  

  

  X. 
  

  

  0-4 
  

  

  0-8 
  

  

  20 
  

  

  40 
  

  

  10 
  

  

  26 
  

  

  40 
  

  

  I. 
  

  

  ill. 
  

  

  •25 
  

  

  •44 
  

  

  •68 
  

  

  •775 
  

  

  •872 
  

  

  •94 
  

  

  •98 
  

  

  0-44 
  

  

  ill. 
  

  

  •09 
  

  

  •16 
  

  

  •38 
  

  

  •645 
  

  

  •816 
  

  

  •93 
  

  

  •97 
  

  

  2*40 
  

  

  ill. 
  

  

  •05 
  

  

  •10 
  

  

  •25 
  

  

  •490 
  

  

  •783 
  

  

  •92 
  

  

  •97 
  

  

  6-99 
  

  

  