﻿662 
  

  

  Prof. 
  J. 
  J. 
  Thomson 
  

  

  From 
  these 
  equations 
  the 
  following 
  determinations 
  of 
  e/m 
  

   and 
  v 
  were 
  made: 
  the 
  value 
  of 
  V 
  was 
  420 
  volts. 
  

  

  Tube 
  filled 
  with 
  Air. 
  

  

  D. 
  

  

  1 
  

   d. 
  cjm. 
  

  

  V, 
  

  

  •5 
  

  

  1-4 
  1CH 
  

  

  2 
  X 
  10 
  8 
  cm./sec. 
  

  

  •4 
  

  

  1-1 
  -78x104 
  

  

  2 
  xlO 
  8 
  „ 
  

  

  •5 
  

  

  1-4 
  10* 
  

  

  2X10 
  8 
  „ 
  

  

  •45 
  

  

  1-3 
  -96x104 
  

  

  2-lxlOs 
  „ 
  

  

  •4 
  

  

  1-4 
  1-25 
  X 
  104 
  

  

  2-5 
  xlO 
  8 
  „ 
  

  

  •4 
  

  

  1-3 
  108x104 
  

  

  2-3 
  XlO 
  8 
  „ 
  

  

  •3 
  

  

  1-1 
  104X104 
  

  

  2-6 
  XlO 
  8 
  „ 
  

  

  

  Mean 
  1-01 
  X 
  10 
  4 
  

  

  

  Tube 
  filled 
  with 
  Hydrogen. 
  

  

  •7 
  

  

  1-7 
  

  

  1-05 
  xlO 
  4 
  

  

  1-8 
  XlO 
  8 
  cm./sec. 
  

  

  •4 
  

  

  1-3 
  

  

  1-08x104 
  

  

  2-3 
  XlO 
  8 
  „ 
  

  

  ■6 
  

  

  1-5 
  

  

  •96x104 
  

  

  1-7 
  XlO 
  8 
  „ 
  

  

  •4 
  

  

  1-3 
  

  

  1-08x104 
  

  

  2-3 
  XlO 
  8 
  „ 
  

  

  Mean 
  l-04xl0 
  4 
  

  

  Fie. 
  2. 
  

  

  The 
  other 
  type 
  of 
  tube 
  (fig. 
  2), 
  in 
  which 
  there 
  were 
  no 
  

   auxiliary 
  electrodes, 
  had 
  the 
  following 
  dimensions 
  : 
  — 
  

  

  Distance 
  between 
  the 
  plates 
  Land 
  M 
  = 
  *4 
  cm. 
  

   Length 
  of 
  plates 
  ......= 
  4 
  cm. 
  

  

  Distance 
  between 
  screen 
  and 
  plate 
  = 
  3*5 
  cm. 
  

  

  