﻿444 
  

  

  Sir 
  J. 
  J. 
  Thomson 
  

  

  on 
  

  

  negative 
  electric 
  force 
  just 
  in 
  front, 
  i. 
  e. 
  on 
  the 
  cathode 
  side 
  

   of 
  the 
  bright 
  part 
  of 
  a 
  striation; 
  this 
  changed 
  to 
  a 
  large 
  

  

  Tig. 
  3. 
  

  

  positive 
  force 
  as 
  soon 
  as 
  the 
  bright 
  boundary 
  of 
  the 
  

   striation 
  was 
  passed 
  ; 
  at 
  a 
  short 
  distance 
  from 
  the 
  front 
  of 
  

   the 
  striation 
  this 
  force 
  began 
  to 
  diminish 
  and 
  went 
  on 
  di- 
  

   minishing 
  until 
  the 
  front 
  of 
  the 
  next 
  striation 
  on 
  the 
  anode 
  

   side 
  was 
  reached. 
  

  

  Though 
  the 
  indications 
  of 
  all 
  these 
  wire 
  explorers 
  agreed 
  

   in 
  pointing 
  to 
  the 
  existence 
  of 
  a 
  negative 
  force 
  in 
  front 
  of 
  

   these 
  striations, 
  yet 
  I 
  felt 
  that 
  the 
  existence 
  of 
  a 
  negative 
  

   force 
  could 
  never 
  be 
  proved 
  by 
  the 
  use 
  of 
  wire 
  detectors. 
  

  

  For 
  let 
  us 
  consider 
  what 
  the 
  existence 
  of 
  a 
  negative 
  

   force 
  implies. 
  The 
  electric 
  current 
  is 
  always 
  in 
  the 
  same 
  

   direction 
  throughout 
  the 
  tube, 
  and 
  therefore 
  the 
  average 
  

  

  