﻿094 
  

  

  Mr. 
  H. 
  Ogden 
  on 
  the 
  

  

  and 
  afterwards 
  re-exhausted. 
  Then 
  the 
  experimental 
  gas 
  

   was 
  allowed 
  partly 
  to 
  fill 
  the 
  outer 
  chamber, 
  which 
  therefore 
  

   contained 
  the 
  impure 
  washings 
  of 
  the 
  small 
  connecting 
  pipes. 
  

   Then 
  the 
  inner 
  chamber 
  was 
  filled, 
  and, 
  when 
  the 
  nature 
  of 
  

   the 
  gas 
  permitted 
  it, 
  was 
  re-exhausted 
  and 
  filled 
  again. 
  All 
  

   the 
  gases 
  were 
  dried 
  where 
  possible 
  by 
  passing 
  over 
  long- 
  

   tubes 
  of 
  P 
  2 
  5 
  after 
  bubbling 
  through 
  concentrated 
  H 
  2 
  S0 
  4 
  . 
  

   Ammonia 
  was 
  dried 
  by 
  quick-lime. 
  Potentials 
  from 
  to 
  

   640 
  volts 
  were 
  applied 
  to 
  the 
  high 
  potential 
  plate 
  and 
  the 
  

   ionization 
  current 
  measured 
  : 
  — 
  

  

  (a) 
  When 
  the 
  radium 
  was 
  covered. 
  (The 
  ft, 
  y 
  ray 
  effect.) 
  

  

  (b) 
  When 
  the 
  radium 
  was 
  uncovered. 
  

  

  The 
  difference 
  between 
  the 
  two 
  gave 
  the 
  effect 
  of 
  the 
  a 
  rays 
  

   alone. 
  The 
  following 
  gases 
  were 
  investigated 
  : 
  — 
  air, 
  oxygen, 
  

   carbon 
  dioxide, 
  carbon 
  monoxide, 
  hydrogen, 
  sulphur 
  dioxide, 
  

   methane, 
  and 
  ammonia. 
  Some 
  of 
  the 
  results 
  obtained 
  are 
  

   given 
  on 
  figs. 
  2 
  & 
  2 
  A. 
  The 
  abscissse 
  give 
  the 
  P.D. 
  in 
  volts, 
  

   the 
  ordinates 
  the 
  corresponding 
  currents 
  expressed 
  as 
  frac- 
  

   tions 
  of 
  the 
  saturation 
  current. 
  

  

  1-0 
  

  

  ..H, 
  7I 
  

  

  3 
  cms. 
  

  

  7°C. 
  

  

  

  

  Fig. 
  2 
  

  

  

  

  

  

  

  / 
  CO 
  1 
  l^a 
  & 
  — 
  

  

  — 
  zz^~-~- 
  — 
  

  

  

  

  

  

  

  •9 
  

   •8 
  

   •7 
  

  

  \p\ 
  

  

  

  

  

  

  5 
  

  

  

  11/ 
  

  

  

  ^ 
  

  

  ^C0 
  2 
  B'2fc 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  •5 
  

  

  1 
  

  

  

  

  

  

  

  

  

  

  k 
  

  

  

  

  

  £D 
  l/o/.rs. 
  

  

  

  

  

  

  ■S 
  

  

  

  

  200 
  

  

  On 
  the 
  basis 
  of 
  the 
  columnar 
  hypothesis 
  Wheelock 
  has 
  

   deduced 
  the 
  following 
  relationship 
  between 
  i, 
  the 
  current 
  

   through 
  the 
  gas, 
  and 
  X, 
  the 
  electric 
  field 
  acting 
  on 
  it 
  : 
  — 
  

  

  i=«,Xlog.(l 
  + 
  |). 
  

  

  