﻿170 
  Dr. 
  J. 
  Kunz 
  on 
  Cathode 
  and 
  

  

  between 
  the 
  normals 
  of 
  the 
  surface 
  and 
  the 
  electric 
  force 
  and 
  

   produce 
  phosphorescence 
  around 
  a 
  circular 
  ring 
  on 
  the 
  glass 
  

  

  rail. 
  

  

  Fia:. 
  8. 
  

  

  Fig. 
  8 
  will 
  give 
  an 
  idea 
  of 
  the 
  distribution 
  of 
  the 
  electric 
  

   force 
  round 
  the 
  cathode 
  at 
  the 
  low 
  pressure. 
  The 
  cathode 
  

   rays 
  begin 
  to 
  ionize 
  the 
  gas 
  at 
  the 
  boundary 
  of 
  Crookes's 
  dark 
  

   space 
  and 
  the 
  negative 
  glow. 
  If 
  now 
  the 
  path 
  of 
  the 
  cathode 
  

   rays 
  is 
  curved, 
  and 
  if 
  the 
  positive 
  ion 
  is 
  produced 
  at 
  P 
  (fig. 
  9), 
  

   then, 
  in 
  consequence 
  of 
  the 
  difference 
  in 
  mass 
  between 
  the 
  

   positive 
  and 
  negative 
  ions, 
  the 
  former 
  will 
  not 
  follow 
  the 
  path 
  

   of 
  the 
  negative 
  corpuscles 
  up 
  to 
  the 
  cathode. 
  They 
  will 
  take 
  

   another 
  way 
  and 
  strike 
  against 
  the 
  inner 
  surface 
  of 
  the 
  cylinder 
  

   along 
  a 
  circle 
  distant 
  a 
  certain 
  length 
  from 
  the 
  end 
  of 
  the 
  tube. 
  

  

  Fiar. 
  9. 
  

  

  + 
  + 
  + 
  + 
  line 
  of 
  electric 
  force. 
  

  

  path 
  of 
  negative 
  Lons 
  t 
  

  

  path 
  of 
  positive 
  ions. 
  

  

  Uong 
  this 
  circle 
  there 
  is 
  a 
  new 
  soxirceof 
  cathode 
  raysstartinc 
  

   in 
  a 
  smaller 
  electric 
  field 
  than 
  those 
  at 
  the 
  end 
  of 
  the 
  tubeand 
  

   i,, 
  a 
  direction 
  between 
  the 
  normal 
  and 
  the 
  electric 
  Eorce, 
  but 
  

   more 
  parallel 
  to 
  the 
  axis 
  than 
  the 
  rays 
  considered 
  jusi 
  before. 
  

   Leaving 
  the 
  hole 
  of 
  the 
  cathode, 
  they 
  come 
  into 
  a 
  stronger 
  

   electric 
  field 
  by 
  which 
  they 
  are 
  necessarily 
  more 
  deflected 
  

  

  