﻿1038 
  Mr. 
  F. 
  W. 
  Wheatley 
  on 
  Ionization 
  of 
  

  

  low 
  as 
  9 
  mm. 
  The 
  value 
  of 
  a 
  is 
  so 
  small 
  that 
  a 
  very 
  small 
  

   error 
  in 
  observation 
  would 
  considerably 
  affect 
  the 
  result. 
  

   Also 
  a 
  1 
  per 
  cent, 
  error 
  in 
  the 
  e.m.f. 
  would 
  make 
  an 
  error 
  of 
  

   about 
  5 
  per 
  cent 
  in 
  a. 
  

  

  With 
  a 
  higher 
  pressure 
  low 
  values 
  of 
  X/p 
  may 
  very 
  easily 
  

   be^ 
  found, 
  and 
  it 
  is 
  intended 
  to 
  extend 
  the 
  experiments 
  by 
  

   using 
  large 
  values 
  of 
  X 
  and 
  p 
  in 
  order 
  to 
  see 
  for 
  what 
  range 
  

   of 
  pressures 
  the 
  formula 
  cc/p=f(Xip) 
  is 
  satisfied 
  accurately. 
  

  

  For 
  X 
  = 
  80to 
  270 
  the 
  numbers 
  at 
  '4, 
  -8, 
  and 
  1*2 
  show 
  that 
  

   the 
  initial 
  ionization 
  is 
  uniform 
  for 
  these 
  distances 
  and 
  almost 
  

   proportional 
  to 
  the 
  distance, 
  and 
  that 
  the 
  ionizing 
  power 
  of 
  

   the 
  a 
  particle 
  does 
  not 
  diminish. 
  

  

  Table 
  I. 
  

   Air. 
  p 
  = 
  9 
  mm. 
  

  

  

  

  

  

  a. 
  obtained 
  from 
  

  

  

  

  

  

  

  

  

  equations 
  

  

  Mean 
  

  

  

  

  X. 
  

  

  "4 
  cm. 
  

  

  '8 
  cm. 
  

  

  1-2 
  cm. 
  

  

  

  Value 
  

  

  »/p. 
  

  

  X/p. 
  

  

  

  

  

  

  

  

  

  1. 
  

  

  2. 
  

  

  3. 
  

  

  of 
  «. 
  

  

  

  

  80 
  

  

  95 
  

  

  190-7 
  

  

  286-8 
  

  

  

  

  

  

  

  9 
  

  

  90 
  

  

  96 
  

  

  192-7 
  

  

  290-0 
  

  

  

  

  

  

  

  10 
  

  

  180 
  

  

  97-5 
  

  

  196-8 
  

  

  297 
  8 
  

  

  

  

  

  

  

  20 
  

  

  270 
  

  

  99-4 
  

  

  202 
  

  

  308-1 
  

  

  

  

  

  

  

  30 
  

  

  360 
  

  

  102-8 
  

  

  2] 
  2-9 
  

  

  331-0 
  

  

  •174 
  

  

  173 
  

  

  •171 
  

  

  '173 
  

  

  •019 
  

  

  40 
  

  

  450 
  

  

  109-9 
  

  

  243-9 
  

  

  407-0 
  

  

  •493 
  

  

  •494 
  

  

  •495 
  

  

  '494 
  

  

  •055 
  

  

  50 
  

  

  540 
  

  

  1211 
  

  

  306-3 
  

  

  5891 
  

  

  1-060 
  

  

  1-060 
  

  

  1-062 
  

  

  1061 
  

  

  118 
  

  

  60 
  

  

  630 
  

  

  143-0 
  

  

  449-8 
  

  

  1107 
  

  

  1-906 
  

  

  1-907 
  

  

  1908 
  

  

  T907 
  

  

  •212 
  

  

  70 
  

  

  720 
  

  

  193-5 
  

  

  832-1 
  

  

  2944 
  

  

  2-989 
  

  

  2-987 
  

  

  2 
  985 
  

  

  2*987 
  

  

  •332 
  

  

  80 
  

  

  810 
  

  

  264-8 
  

  

  1868 
  

  

  11200 
  

  

  4-418 
  

  

  4-452 
  

  

  4-502 
  

  

  4 
  '457 
  

  

  •495 
  

  

  90 
  

  

  900 
  

  

  384-8 
  

  

  5780 
  

  

  81200 
  

  

  6-594 
  

  

  6-610 
  

  

  6600 
  

  

  6-601 
  

  

  •733 
  

  

  100 
  

  

  

  

  Air 
  

  

  p 
  = 
  6 
  mm. 
  

  

  

  

  ; 
  . 
  ; 
  | 
  

  

  Sol 
  65-3 
  

  

  130-8 
  

  

  196-5 
  

  

  

  

  

  

  ■• 
  

  

  9 
  

  

  480 
  104-3 
  

  

  335-6 
  

  

  834-8 
  1 
  

  

  1-944 
  

  

  1-958 
  

  

  1-970 
  

  

  1-957 
  

  

  •326 
  

  

  80 
  

  

  

  

  Air. 
  

  

  p 
  = 
  3 
  mm. 
  

  

  

  

  ! 
  

  

  80 
  

  

  35-6 
  

  

  71-2 
  

  

  107 
  

  

  

  

  

  

  

  9 
  

  

  240 
  

  

  44-3 
  

  

  110-1 
  

  

  207-1 
  

  

  •979 
  

  

  •979 
  

  

  •984 
  

  

  •981 
  

  

  •327 
  

  

  80 
  

  

  i 
  

  

  If 
  a, 
  b, 
  c 
  be 
  the 
  readings 
  at 
  *4, 
  *S, 
  1*2 
  cm. 
  

   then 
  the 
  three 
  equations 
  are 
  : 
  

  

  (1) 
  c^zhe^ 
  + 
  a, 
  

  

  (2) 
  c 
  = 
  ae** 
  + 
  b. 
  

  

  (3) 
  h=ae' 
  m 
  +a. 
  

  

  