﻿Positive 
  Ray 
  i 
  

  

  701 
  

  

  of 
  molecular 
  attraction 
  occurred 
  to 
  me 
  ; 
  but 
  experiment 
  

   showed 
  that 
  all 
  negative 
  rays 
  had 
  been 
  driven 
  out 
  o£ 
  the 
  

   field. 
  Moreover, 
  by 
  producing 
  a 
  difference 
  o£ 
  electrostatic 
  

   potential 
  the 
  entire' 
  phosphorescent 
  band 
  or 
  magnetic 
  spec- 
  

   trum 
  moved 
  in 
  the 
  direction 
  the 
  positive 
  rays 
  should 
  move. 
  

   In 
  fig. 
  5 
  it 
  will 
  be 
  noticed 
  that 
  the 
  band 
  moved 
  to 
  the 
  smaller 
  

   pointer 
  j 
  whereas 
  if 
  the 
  portion 
  of 
  the 
  band 
  to 
  the 
  right 
  of 
  

   the 
  pointers 
  was 
  made 
  up 
  of 
  negative 
  rays 
  and 
  that 
  to 
  the 
  

   left 
  of 
  positive 
  rays, 
  the 
  band 
  would 
  not 
  have 
  moved 
  parallel 
  

   to 
  its 
  original 
  position. 
  

  

  In 
  order 
  to 
  ascertain 
  why 
  the 
  band 
  spread 
  to 
  the 
  right 
  

   and 
  left 
  of 
  the 
  middle 
  of 
  the 
  screen, 
  I 
  introduced 
  a 
  septum 
  

   of 
  glass 
  in 
  the 
  middle 
  of 
  the 
  tube 
  constituting 
  the 
  canal 
  

  

  region, 
  fig. 
  6. 
  This 
  septum 
  was 
  

   welded 
  to 
  the 
  end 
  of 
  the 
  tube 
  and 
  

   was 
  coated 
  on 
  both 
  sides 
  with 
  

   willemite. 
  The 
  band 
  of 
  phos- 
  

   phorescence 
  now 
  appeared 
  mainly 
  

   on 
  one 
  side 
  of 
  the 
  partition. 
  By 
  

   greatly 
  weakening 
  the 
  magnetic 
  

   Held 
  the 
  negative 
  rays 
  were 
  brought 
  

   upon 
  the 
  screen 
  to 
  the 
  left 
  of 
  the 
  

   partition 
  : 
  while 
  the 
  positive 
  rays 
  

   appeared 
  on 
  the 
  right 
  of 
  this 
  parti- 
  

   tion 
  ; 
  thus 
  proving 
  again 
  that 
  the 
  

   unobstructed 
  band 
  was 
  made 
  up 
  

   of 
  positive 
  rays. 
  A 
  large 
  storage- 
  

   battery 
  proved 
  the 
  best 
  means 
  of 
  

   studying 
  the 
  positive 
  band 
  ; 
  for 
  the 
  phenomenon 
  was 
  not 
  

   confused 
  by 
  the 
  make 
  and 
  break 
  of 
  mechanical 
  or 
  electrolytic 
  

   interrupters. 
  It 
  was 
  soon 
  discovered 
  that 
  a 
  narrow 
  phos- 
  

   phorescent 
  band 
  w 
  r 
  as 
  formed 
  on 
  the 
  side 
  of 
  the 
  septum 
  which 
  

   shielded 
  the 
  end 
  of 
  the 
  tube. 
  

  

  The 
  explanation 
  of 
  the 
  band 
  in 
  the 
  tube 
  without 
  the 
  

   septum 
  was 
  evidently 
  this 
  : 
  the 
  pilot 
  spark 
  produces 
  a 
  number 
  

   of 
  positive 
  rays 
  of 
  different 
  velocities 
  which 
  spread 
  out 
  in 
  

   the 
  form 
  of 
  a 
  cone 
  of 
  which 
  the 
  apex 
  is 
  the 
  narrow 
  orifice 
  

   in 
  the 
  cathode 
  terminal 
  ; 
  under 
  the 
  influence 
  of 
  the 
  magnetic 
  

   field 
  these 
  rays 
  whirl 
  around 
  in 
  the 
  field 
  somewhat 
  in 
  the 
  

   manner 
  indicated 
  by 
  the 
  dotted 
  lines, 
  fig. 
  6. 
  

  

  In 
  the 
  expression 
  p 
  = 
  — 
  n 
  — 
  = 
  — 
  ^ 
  can 
  have 
  manv 
  values 
  de- 
  

   r 
  r 
  mn. 
  sin 
  6 
  

  

  pending 
  upon 
  the 
  values 
  of 
  v. 
  The 
  narrowness 
  of 
  the 
  band 
  

  

  results 
  from 
  the 
  electrodynamic 
  attraction 
  of 
  the 
  whirls 
  in 
  

  

  a 
  manner 
  similar 
  to 
  the 
  attraction 
  of 
  electrical 
  currents 
  

  

  moving 
  in 
  the 
  same 
  direction. 
  

  

  