﻿762 
  Prof. 
  0. 
  W. 
  Richardson 
  on 
  the 
  Specific 
  

  

  40 
  volts 
  were 
  used. 
  This 
  was 
  apparently 
  due 
  to 
  secondary 
  

   rays 
  or 
  scattered 
  primary 
  rays 
  being 
  emitted 
  by 
  the 
  electrode 
  

   behind 
  the 
  slit, 
  so 
  that 
  this 
  did 
  not 
  appear 
  to" 
  absorb 
  its 
  full 
  

   proportion 
  of 
  the 
  negative 
  electrons 
  which 
  reached 
  it. 
  

  

  The 
  temperature 
  during 
  the 
  experiments 
  on 
  the 
  negative 
  

   ions 
  was 
  higher 
  than 
  in 
  the 
  case 
  of 
  the 
  positive 
  ions, 
  most 
  of 
  

   the 
  observations 
  being 
  made 
  between 
  1100° 
  and 
  1200° 
  C. 
  

  

  e/m 
  for 
  the 
  Negative 
  Ions. 
  

   The 
  results 
  of 
  all 
  the 
  complete 
  experiments 
  which 
  led 
  to 
  

   vames 
  of 
  e\m 
  for 
  the 
  negative 
  ions 
  from 
  carbon 
  are 
  given 
  in 
  

   the 
  next 
  table. 
  

  

  V. 
  

  

  (volts.) 
  

  

  H. 
  

  

  (lines 
  per 
  cm. 
  2 
  ) 
  

  

  Z. 
  

  

  (cms.) 
  

  

  1 
  

   x. 
  e/m. 
  

   (1 
  = 
  1)635 
  cm.) 
  E.M. 
  units. 
  

  

  1 
  

  

  129 
  

   366 
  

   345 
  

  

  13-5 
  

   24-3 
  

   945 
  

  

  •677 
  

   •677 
  

   •568 
  

  

  160 
  1-57x10" 
  

   1-54 
  1-27x107 
  

   1-56 
  1'64 
  XlO 
  7 
  

  

  Mean 
  e/m= 
  1-49 
  xlO 
  7 
  . 
  

  

  Fiflf. 
  5. 
  

  

  1-6 
  

  

  1-4 
  

  

  •2 
  

  

  •0 
  

  

  •8 
  

  

  

  

  

  

  

  

  

  

  

  

  \ 
  

  

  

  

  

  

  

  

  

  . 
  

  

  \ 
  s** 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  s* 
  H* 
  

  

  ■■ 
  + 
  13-5 
  

  

  

  

  

  

  //= 
  -/J- 
  

  

  ff 
  

  

  

  

  

  H 
  = 
  

  

  O 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  7 
  8 
  9 
  10 
  

  

  — 
  *" 
  ^ 
  C/IL£ 
  & 
  <x(/= 
  • 
  0655 
  cm.) 
  

  

  13 
  

  

  14 
  

  

  The 
  curves 
  obtained 
  in 
  one 
  of 
  the 
  experiments 
  which 
  

   determined 
  the 
  value 
  of 
  e/m 
  for 
  the 
  negative 
  ions 
  from 
  hot 
  

  

  