﻿on 
  Columnar 
  Ionization. 
  

  

  519 
  

  

  r 
  t 
  for 
  high 
  values 
  of 
  the 
  electric 
  field 
  shows 
  that 
  the 
  oblique 
  

   rays 
  were 
  responsible 
  for 
  the 
  small 
  values 
  of 
  r 
  t 
  relatively 
  to 
  

   those 
  of 
  Ti 
  w 
  r 
  hen 
  the 
  whole 
  slit 
  was 
  employed 
  as 
  described 
  

   above. 
  

  

  In 
  order 
  to 
  examine 
  more 
  closely 
  the 
  effect 
  when 
  the 
  

   oblique 
  rays 
  alone 
  were 
  made 
  effective 
  by 
  eliminating 
  those 
  

   from 
  the 
  central 
  portion 
  of 
  the 
  slit, 
  readings 
  were 
  taken 
  of 
  

   the 
  ionization 
  current 
  for 
  different 
  gas-pressures 
  in 
  both 
  the 
  

   longitudinal 
  and 
  transverse 
  fields. 
  From 
  the 
  figures 
  given 
  

   in 
  Table 
  VI., 
  one 
  sees 
  that 
  the 
  increase 
  of 
  the 
  current 
  with 
  

   the 
  pressure 
  is 
  quite 
  normal 
  in 
  the 
  case 
  of 
  the 
  longitudinal 
  

   field, 
  but 
  that 
  the 
  current 
  at 
  a 
  pressure 
  of 
  760 
  mm. 
  of 
  

   mercury 
  in 
  the 
  transverse 
  field 
  shows 
  a 
  distinct 
  falling 
  off 
  

   from 
  the 
  normal 
  law. 
  This 
  result 
  was 
  surprising 
  in 
  view 
  

   of 
  the 
  calculations 
  for 
  the 
  position 
  of 
  the 
  cone 
  of 
  rays 
  

   emerging 
  from 
  the 
  slit. 
  It 
  indicates 
  probably 
  that 
  an 
  

   appreciable 
  fraction 
  of 
  the 
  alpha 
  particles 
  are 
  scattered 
  

   into 
  the 
  electrodes 
  of 
  the 
  transverse 
  field, 
  thus 
  diminishing 
  

   the 
  ionization 
  current. 
  In 
  the 
  longitudinal 
  field 
  there 
  

   would 
  not 
  be 
  a 
  diminution 
  of 
  the 
  current, 
  as 
  the 
  particles 
  

   would 
  be 
  merely 
  scattered 
  in 
  the 
  gas. 
  

  

  Table 
  VI. 
  

   Oblique 
  rays. 
  d=2'68 
  cm.; 
  X,= 
  1580; 
  X,= 
  630. 
  

  

  p- 
  

  

  H- 
  

  

  H- 
  

  

  hIp- 
  

  

  h/p- 
  

  

  hIh- 
  

  

  mm. 
  

  

  

  

  

  

  

  153 
  

  

  0-47 
  

  

  0-41 
  

  

  3-07 
  Xl0~ 
  3 
  

  

  2-68 
  x 
  10 
  — 
  3 
  

  

  1-14 
  

  

  232 
  

  

  073 
  

  

  0-65 
  

  

  314 
  „ 
  

  

  2-80 
  „ 
  

  

  1-12 
  

  

  261 
  

  

  0-84 
  

  

  0-74 
  

  

  322 
  „ 
  

  

  2-84 
  „ 
  

  

  1-13 
  

  

  284 
  

  

  092 
  

  

  0-81 
  

  

  3-24 
  „ 
  

  

  2-85 
  „ 
  

  

  1-13 
  

  

  370 
  

  

  1-24 
  

  

  110 
  

  

  3-36 
  „ 
  

  

  2-98 
  „ 
  

  

  113 
  

  

  400 
  

  

  1-36 
  

  

  1-21 
  

  

  3-40 
  „ 
  

  

  3-03 
  „ 
  

  

  1-12 
  

  

  446 
  

  

  1-56 
  

  

  1-39 
  

  

  3-50 
  „ 
  

  

  3-12 
  „ 
  

  

  1-12 
  

  

  596 
  

  

  2-25 
  

  

  1-99 
  

  

  377 
  „ 
  

  

  3-34 
  „ 
  

  

  1-13 
  

  

  760 
  

  

  3-15 
  

  

  2-55 
  

  

  4-15 
  „ 
  

  

  3-38 
  „ 
  

  

  1-23 
  

  

  The 
  experimental 
  results 
  obtained 
  when 
  the 
  rays 
  were 
  

   canalized 
  are 
  thus 
  the 
  only 
  results 
  which 
  admit 
  of 
  strict 
  

   interpretation 
  ; 
  and 
  they 
  show 
  that 
  n 
  and 
  r 
  t 
  both 
  tend 
  to 
  

   the 
  same 
  maximum 
  value. 
  In 
  other 
  words, 
  in 
  accordance 
  

  

  