﻿Velocities 
  of 
  Delta 
  Rays, 
  2 
  1 
  5 
  

  

  vacuum. 
  The 
  figure 
  shows 
  graphically 
  the 
  results 
  of 
  measure- 
  

   ments, 
  all 
  of 
  which 
  were 
  made 
  on 
  the 
  same 
  day, 
  after 
  the 
  

   vacuum 
  had 
  been 
  maintained 
  for 
  eight 
  days. 
  Curve 
  I 
  shows 
  

   the 
  currents 
  received 
  by 
  the 
  electrode, 
  with 
  the 
  case 
  grounded 
  

  

  

  

  

  

  

  

  F 
  

  

  ig. 
  4. 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  [ 
  

  

  | 
  

  

  

  

  

  

  

  

  I- 
  o» 
  txilHCO; 
  POTCwl 
  

  

  r- 
  

  

  

  .~iiic 
  mm 
  

  

  

  

  

  

  

  

  ■ 
  

  

  1 
  

  

  Si 
  

  

  

  

  

  

  

  

  

  

  

  

  

  < 
  

  

  ts*__ 
  

  

  

  ^^> 
  

  

  

  

  

  

  

  

  

  

  

  

  

  : 
  d 
  

  

  r^ 
  

  

  Jt 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  *-JL»Jl 
  — 
  ■ 
  — 
  ' 
  

  

  

  

  

  

  

  

  

  

  

  

  and 
  with 
  negative 
  potentials 
  between 
  20 
  and 
  1200 
  volts 
  on 
  

   the 
  gauze 
  cage. 
  Curve 
  II 
  represents 
  the 
  currents 
  when 
  

   both 
  case 
  and 
  gauze 
  are 
  charged 
  alike. 
  Curves 
  I' 
  and 
  IF 
  

   give 
  the 
  currents 
  observed 
  under 
  similar 
  electrical 
  conditions 
  

   a< 
  in 
  I 
  and 
  II 
  respectively, 
  but 
  with 
  a 
  magnetic 
  field 
  suf- 
  

   ficient 
  to 
  give 
  its 
  maximum 
  effect. 
  Curve 
  I 
  is 
  similar 
  to 
  

   those 
  plotted 
  in 
  fig. 
  3 
  except 
  for 
  the 
  change 
  in 
  scale 
  due 
  to 
  

   the 
  altered 
  capacity, 
  and 
  for 
  the 
  fact 
  that 
  it 
  begins 
  at 
  20 
  

   volts 
  instead 
  of 
  40. 
  According 
  to 
  the 
  views 
  advanced 
  in 
  § 
  4, 
  

   an 
  ordinate 
  of 
  this 
  curve 
  represents 
  (with 
  more 
  or 
  less 
  

   accuracy) 
  the 
  number 
  of 
  electrons 
  whose 
  energies 
  are 
  greater 
  

   than 
  that 
  represented 
  by 
  the 
  abscissa 
  ; 
  these 
  ordinates, 
  how- 
  

   ever, 
  are 
  to 
  be 
  measured, 
  not 
  from 
  the 
  axis, 
  but 
  from 
  a 
  line 
  

   below 
  it 
  representing 
  the 
  constant 
  current 
  received 
  by 
  the 
  

   electrode. 
  This 
  corrected 
  zero 
  line 
  may 
  coincide 
  with 
  I', 
  or 
  

   it 
  may 
  fall 
  below 
  it, 
  since 
  it 
  is 
  not 
  certain 
  that 
  all 
  the 
  carriers 
  

   of 
  this 
  current 
  get 
  through 
  the 
  magnetic 
  field. 
  Curve 
  II 
  

   represents 
  the 
  resultant 
  of 
  the 
  current 
  of 
  8-electrons 
  from 
  

   the 
  source, 
  and 
  the 
  current 
  of 
  tertiary 
  electrons 
  from 
  the 
  

   case: 
  at 
  20 
  volts 
  the 
  8-ray 
  current 
  predominates, 
  but 
  at 
  

   higher 
  potentials 
  th 
  r> 
  tertiary 
  electrons 
  are 
  in 
  the 
  majority. 
  

  

  