﻿180 
  Dr. 
  J. 
  Kuuz 
  on 
  Cathode 
  and 
  

  

  it 
  will 
  ionize 
  the 
  gas 
  between 
  the 
  two 
  plates 
  and 
  travel 
  along 
  

   the 
  line 
  ABj. 
  

  

  Fig. 
  21. 
  

  

  A 
  positive 
  ion 
  such 
  as 
  p 
  2 
  , 
  driving 
  from 
  the 
  negative 
  glow 
  

   in 
  the 
  direction 
  D 
  G, 
  will 
  be 
  deflected 
  from 
  its 
  straight 
  course, 
  

   being 
  attracted 
  by 
  the 
  electricity 
  stored 
  up 
  along 
  the 
  side 
  s 
  y 
  

   and 
  at 
  the 
  corner 
  C 
  3 
  . 
  The 
  path 
  of 
  p 
  2 
  will 
  therefore 
  be 
  along 
  

   the 
  dotted 
  line 
  DB 
  2 
  , 
  while 
  the 
  path 
  of 
  p 
  z 
  will 
  be 
  along 
  EB 
  3 
  . 
  

   All 
  the 
  positive 
  particles 
  attracted 
  from 
  the 
  negative 
  glow 
  

   between 
  D 
  and 
  E 
  will 
  leave 
  the 
  triangle 
  in 
  a 
  narrow 
  bundle 
  

   from 
  the 
  opposite 
  corner, 
  whereas 
  the 
  beam 
  of 
  cathode 
  rays 
  

   will 
  be 
  much 
  broader, 
  and 
  this 
  in 
  many 
  cases 
  has 
  been 
  observed 
  

   (see 
  tigs. 
  17 
  and 
  19). 
  The 
  same 
  considerations 
  apply 
  to 
  the 
  

   two 
  other 
  sides 
  of 
  the 
  triangle. 
  AVe 
  see 
  from 
  tig. 
  21 
  also 
  

   tbat 
  there 
  will 
  be 
  at 
  each 
  corner 
  a 
  small 
  angular 
  interval 
  

   such 
  as 
  EF, 
  from 
  the 
  negative 
  glow 
  of 
  which 
  the 
  positive 
  

   [(articles, 
  few 
  in 
  number, 
  are 
  subject 
  to 
  the 
  same 
  force 
  of 
  

   attraction 
  from 
  the 
  side 
  s 
  2 
  as 
  side 
  t 
  s- 
  3 
  . 
  These 
  ions 
  will 
  

   leave 
  the 
  triangle 
  from 
  the 
  opposite 
  side 
  s 
  x 
  , 
  A< 
  they 
  pass 
  

   through 
  a 
  field 
  of 
  strong 
  negative 
  electrification 
  they 
  are 
  

   very 
  likely 
  to 
  get 
  neutralized. 
  

  

  It 
  follows 
  from 
  this 
  explanation 
  that 
  by 
  closing 
  the 
  side 
  

   ED 
  between 
  the 
  two 
  plates, 
  both 
  the 
  blue 
  beam 
  perpendicular 
  

   to 
  this 
  side 
  and 
  the 
  red 
  beam 
  starting 
  from 
  the 
  opposite 
  

   corner 
  should 
  disappear, 
  whereas 
  by 
  putting 
  an 
  obstacle 
  

   between 
  the 
  two 
  plates 
  at 
  the 
  eorner 
  C 
  8 
  the 
  red 
  positive 
  rav 
  

   trom 
  this 
  corner 
  should 
  disappear, 
  while 
  the 
  cathode 
  rays 
  

   from 
  the 
  opposite 
  side 
  should 
  not. 
  Both 
  deductions 
  agree 
  

   well 
  with 
  the 
  facts 
  observed. 
  

  

  The 
  blue 
  beam, 
  tin- 
  Length 
  of 
  which 
  is 
  increasing 
  with 
  

  

  