﻿248 
  

  

  Prof. 
  H. 
  A. 
  Bumstead 
  on 
  the 
  

  

  the 
  diminution 
  in 
  the 
  ordinates 
  is 
  too 
  rapid 
  at 
  the 
  lower 
  

   potentials 
  and 
  too 
  slow 
  at 
  the 
  higher. 
  If 
  we 
  plot 
  \/V 
  

   instead 
  of 
  V, 
  thus 
  making 
  the 
  abscissae 
  proportional 
  to 
  

   velocities 
  instead 
  of 
  to 
  kinetic 
  energies, 
  the 
  result 
  is 
  still 
  

   very 
  far 
  from 
  an 
  exponential 
  curve. 
  

  

  Fier. 
  5. 
  

  

  20 
  

  

  25 
  

  

  30 
  35 
  40 
  45 
  

  

  NEGATIVE 
  VOLTS 
  ON 
  GAUZE. 
  

  

  The 
  form 
  of 
  the 
  curves, 
  however, 
  for 
  both 
  the 
  swifter 
  and 
  

   the 
  slower 
  electrons 
  suggests 
  an 
  equation 
  of 
  the 
  form 
  yx 
  n 
  —Q, 
  

   In 
  fact, 
  a 
  very 
  fair 
  agreement 
  between 
  the 
  observations 
  

   from 
  30 
  to 
  500 
  volts 
  and 
  this 
  equation 
  may 
  be 
  obtained 
  by 
  

   using 
  n 
  = 
  0*75, 
  as 
  may 
  be 
  seen 
  from 
  Table 
  II. 
  In 
  this 
  

   table 
  the 
  observed 
  currents 
  have 
  been 
  increased 
  by 
  12 
  units 
  

   to 
  allow 
  for 
  the 
  ionic 
  current 
  discussed 
  above. 
  

  

  The 
  departure 
  of 
  the 
  observations 
  from 
  the 
  equation 
  at 
  

   the 
  higher 
  voltages 
  may 
  or 
  may 
  not 
  be 
  of 
  significance, 
  since 
  

   the 
  currents 
  under 
  these 
  conditions 
  were 
  small 
  and 
  could 
  not 
  

   be 
  very 
  accurately 
  measured, 
  and 
  the 
  placing 
  of 
  the 
  zero 
  

  

  