﻿Positive 
  Electricity, 
  825 
  

  

  reaching 
  the 
  screen), 
  while 
  the 
  positive 
  has 
  been 
  affected 
  by 
  the 
  

   magnet 
  to 
  just 
  the 
  same 
  extent 
  as 
  those 
  which 
  were 
  positively 
  

   electrified 
  in 
  the 
  field 
  o£ 
  the 
  first 
  magnet 
  ; 
  this 
  shows 
  that 
  the 
  

   rays 
  which 
  break 
  up 
  in 
  the 
  journey 
  move 
  with 
  the 
  same 
  

   velocity 
  and 
  possess 
  the 
  same 
  charge 
  as 
  those 
  which 
  break 
  up 
  

   at 
  an 
  earlier 
  stage. 
  

  

  Fig. 
  5. 
  Fig. 
  6. 
  

  

  I 
  

  

  =11 
  

  

  i 
  

  

  %h 
  

  

  The 
  relative 
  brightness 
  of 
  the 
  spots 
  a 
  and 
  h 
  varies 
  a 
  good 
  

   deal 
  with 
  the 
  pressure. 
  I 
  have 
  found 
  that 
  when 
  the 
  pressure 
  

   is 
  reduced 
  the 
  spot 
  a 
  gets 
  fainter 
  than 
  h, 
  though 
  at 
  higher 
  

   pressures 
  it 
  might 
  have 
  been 
  brighter. 
  This 
  is 
  what 
  we 
  

   should 
  expect, 
  since 
  at 
  the 
  lower 
  pressure 
  the 
  neutral 
  

   doublets 
  make 
  few^er 
  collisions 
  in 
  their 
  course 
  between 
  the 
  

   two 
  magnets, 
  and 
  so 
  fewer 
  of 
  these 
  are 
  broken 
  up 
  into 
  ions. 
  

   Again, 
  as 
  the 
  pressure 
  increases, 
  the 
  spots 
  become 
  less 
  well- 
  

   defined, 
  there 
  is 
  more 
  luminosity 
  between 
  the 
  original 
  and 
  

   the 
  displaced 
  positions 
  of 
  the 
  spots 
  ; 
  for 
  example, 
  there 
  

   may 
  be 
  considerable 
  luminosity 
  between 
  the 
  position 
  of 
  h 
  

   when 
  the 
  vertical 
  magnetic 
  field 
  is 
  off 
  and 
  V, 
  the 
  luminosity 
  

   stretching 
  right 
  up 
  to 
  h' 
  . 
  

  

  This 
  shows 
  that 
  at 
  this 
  pressure 
  some 
  of 
  the 
  particles 
  

   which 
  were 
  positively 
  charged 
  \vhen 
  they 
  were 
  passing 
  

   through 
  the 
  first 
  electromagnet 
  have 
  got 
  neutralized 
  before 
  

   reaching 
  the 
  second 
  and 
  so 
  are 
  not 
  deflected 
  by 
  it. 
  The 
  

   breaking 
  up 
  and 
  re-formation 
  of 
  the 
  doublets 
  become 
  more 
  

  

  