﻿758 
  

  

  Prof. 
  0. 
  W. 
  Richardson 
  on 
  the 
  Specific 
  

  

  exist 
  through 
  a 
  number 
  of 
  experiments 
  and 
  then 
  suddenly 
  

   disappear. 
  In 
  fig. 
  3 
  z 
  was 
  also 
  *534 
  cm., 
  whilst 
  V 
  was 
  

   increased 
  to 
  324 
  volts. 
  The 
  two 
  curves 
  correspond 
  to 
  

   H=+4670 
  lines 
  per 
  square 
  cm. 
  respectively. 
  Here 
  again 
  

   the 
  curves 
  give 
  no 
  indication 
  of 
  absence 
  of 
  homogeneity. 
  The 
  

   temperature 
  during 
  the 
  experiment 
  which 
  fig. 
  3 
  represents 
  

   was 
  about 
  900°, 
  and 
  during 
  fig. 
  4 
  about 
  800°. 
  In 
  the 
  case 
  

   of 
  carbon 
  inhomogeneity 
  was 
  not 
  so 
  definitely 
  excluded. 
  

   The 
  patterns 
  were 
  so 
  broad 
  under 
  all 
  circumstances 
  that 
  a 
  

   considerable 
  broadening 
  might 
  have 
  occurred 
  in 
  the 
  magnetic 
  

   field 
  without 
  being 
  detected. 
  

  

  Kinetic 
  Energy 
  of 
  the 
  Ions. 
  

  

  The 
  form 
  of 
  curves 
  such 
  as 
  those 
  in 
  figs. 
  3 
  & 
  4 
  is 
  deter- 
  

   mined 
  by 
  the 
  kinetic 
  energy 
  of 
  the 
  emitted 
  ions 
  and 
  the 
  

   value 
  of 
  the 
  electric 
  field 
  between 
  the 
  plates. 
  From 
  these 
  

   curves 
  important 
  conclusions 
  can 
  be 
  drawn 
  as 
  to 
  the 
  magni- 
  

   tude 
  of 
  this 
  energy. 
  This 
  subject 
  will 
  be 
  treated 
  in 
  a 
  

   separate 
  paper. 
  

  

  Positive 
  Ionization 
  from 
  Platinum. 
  

  

  We 
  have 
  seen 
  that 
  the 
  displacement 
  x 
  of 
  the 
  maximum 
  

   point 
  in 
  the 
  curves 
  is 
  given 
  by 
  the 
  formula 
  

  

  so 
  that 
  for 
  a 
  constant 
  value 
  of 
  z 
  the 
  quantity 
  ^ 
  VV 
  should 
  

  

  remain 
  constant. 
  A 
  series 
  of 
  determinations 
  of 
  x 
  with 
  

   different 
  values 
  of 
  H 
  and 
  V, 
  with 
  z 
  equal 
  to 
  *534 
  cm., 
  were 
  

   made 
  to 
  test 
  this 
  question. 
  The 
  results 
  are 
  given 
  in 
  the 
  

   subjoined 
  table 
  : 
  — 
  

  

  V. 
  

  

  (volts.) 
  

  

  Vv\ 
  

  

  H. 
  

  

  (lines 
  per 
  cm. 
  2 
  ) 
  

  

  (1 
  = 
  -0635 
  cm.) 
  

  

  

  78 
  

  

  8-84 
  

  

  4670 
  

  

  1-85 
  

  

  35-0 
  

  

  781 
  

  

  8-85 
  

  

  4670 
  

  

  1-71 
  

  

  32-4 
  

  

  324 
  

  

  18-01 
  

  

  4670 
  

  

  0-97 
  

  

  37-3 
  

  

  78-5 
  

  

  8-87 
  

  

  3000 
  

  

  104 
  

  

  308 
  

  

  The 
  constancy 
  of 
  the 
  numbers 
  in 
  the 
  last 
  column 
  is 
  not 
  

   all 
  that 
  might 
  be 
  desired, 
  but 
  the 
  experimental 
  error 
  is 
  

  

  