﻿Energy 
  of 
  tlie 
  Ions 
  emitted 
  hy 
  Hot 
  Bodies. 
  909 
  

  

  that 
  these 
  involve 
  f 
  the 
  width 
  o£ 
  the 
  slit 
  and 
  ?i 
  1 
  the 
  total 
  

   number 
  of 
  ions 
  emitted 
  by 
  the 
  strip. 
  The 
  latter 
  of 
  course 
  

   is 
  a 
  function 
  of 
  the 
  temperature. 
  

  

  Fio-. 
  6. 
  

  

  *\ 
  

  

  •u 
  

   9 
  

   6 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  / 
  

  

  y 
  

  

  

  

  

  

  X 
  

  

  ~\ 
  

  

  

  

  

  

  

  

  

  A 
  

  

  / 
  

  

  

  

  j 
  

  

  

  

  

  

  

  N 
  

  

  1 
  

  

  

  

  

  7 
  

  

  6 
  

   •5 
  

   •4 
  

   •3 
  

   •2 
  

  

  

  / 
  

  

  / 
  

  

  

  

  

  / 
  

  

  

  

  

  

  

  

  V 
  

  

  

  

  / 
  

  

  / 
  

  

  

  

  

  

  / 
  

  

  

  

  

  

  

  

  

  

  

  

  / 
  

  

  

  

  

  

  

  / 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  / 
  

  

  

  

  

  \ 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  \ 
  

  

  

  

  

  

  

  

  ■6 
  -; 
  

  

  

  

  

  

  

  

  

  

  

  ^ 
  

  

  \ 
  

  

  

  

  

  

  

  n 
  

  

  

  

  

  5 
  

  

  4 
  

  

  3 
  

  

  2 
  

  

  1 
  ( 
  

  

  ) 
  -1 
  

  

  •2 
  

  

  •3 
  

  

  •4 
  

  

  ■5 
  

  

  •6 
  

  

  •7 
  

  

  •8 
  

  

  •9 
  

  

  If 
  the 
  distribution 
  of 
  the 
  velocity 
  components 
  among 
  the 
  

   ions 
  is 
  determined 
  by 
  exponential 
  functions 
  of 
  the 
  type 
  

   required 
  by 
  Maxwell's 
  law, 
  the 
  formulae 
  (II) 
  to 
  (14) 
  will 
  

   hold 
  whatever 
  value 
  the 
  constant 
  k, 
  which 
  determines 
  the 
  

   mean 
  energy, 
  may 
  have. 
  If 
  this 
  constant 
  has 
  different 
  

   values, 
  say 
  k 
  for 
  the 
  normal 
  and 
  ak 
  for 
  the 
  sideways 
  com- 
  

   ponent, 
  the 
  distribution 
  formulae 
  being 
  otherwise 
  as 
  before, 
  

   formula 
  (13) 
  becomes 
  

  

  i/i= 
  __i 
  

  

  ( 
  1+ 
  -5) 
  

  

  The 
  curve 
  w 
  T 
  ill 
  thus 
  be 
  spread 
  out 
  along 
  the 
  % 
  axis 
  by 
  an 
  

   amount 
  which 
  would 
  enable 
  a, 
  to 
  be 
  determined. 
  

  

  The 
  experimental 
  investigation 
  of 
  the 
  case 
  when 
  V 
  = 
  

   has 
  had 
  to 
  be 
  postponed 
  as 
  the 
  apparatus 
  employed 
  in 
  the 
  

   rest 
  of 
  this 
  investigation 
  was 
  unsuited 
  to 
  the 
  purpose. 
  

  

  § 
  9. 
  All 
  the 
  preceding 
  methods 
  of 
  analysing 
  the 
  expe- 
  

   rimental 
  curves 
  involve 
  the 
  principle 
  of 
  making 
  a 
  certain 
  

   hypothesis 
  as 
  to 
  the 
  mode 
  of 
  distribution 
  of 
  the 
  energy 
  

   among 
  the 
  emitted 
  ions 
  and 
  then 
  examining 
  the 
  curves 
  in 
  

   such 
  a 
  way 
  as 
  to 
  show 
  whether 
  they 
  are 
  consistent 
  with 
  the 
  

   consequences 
  of 
  that 
  hypothesis. 
  It 
  is 
  important 
  to 
  have 
  a 
  

  

  