﻿the 
  Conductivity 
  of 
  Liquids 
  in 
  Thin 
  Layers. 
  261 
  

  

  on 
  reversing 
  it 
  the 
  resistance 
  appeared 
  to 
  drop 
  suddenly 
  to 
  a 
  

   minimum, 
  and 
  then 
  begin 
  to 
  rise 
  again 
  gradually. 
  The 
  

   following 
  figures 
  show 
  this 
  effect 
  with 
  a 
  layer 
  *628 
  mm. 
  thick. 
  

   D 
  is 
  the 
  deflexion 
  of 
  the 
  galvanometer 
  : 
  — 
  

  

  Table 
  II. 
  

  

  . 
  T 
  ' 
  

  

  minutes. 
  

  

  D. 
  

  

  - 
  

  

  r, 
  

   ohms. 
  

  

  2£ 
  

  

  156 
  

  

  28,300 
  

  

  134 
  

  

  114 
  

  

  38,700 
  

  

  Eeversed. 
  

  

  

  

  13| 
  

  

  w 
  

  

  30,600 
  

  

  14 
  

  

  124 
  

  

  35,600 
  

  

  24 
  

  

  108 
  

  

  40,900 
  

  

  Eeversed. 
  

  

  

  

  244 
  

  

  182 
  

  

  24,200 
  

  

  3U 
  

  

  126 
  

  

  35,000 
  

  

  i 
  

   1 
  

  

  With 
  a 
  thicker 
  layer 
  the 
  fall 
  of 
  resistance 
  after 
  reversal 
  

   was 
  not 
  so 
  sudden. 
  Thus 
  for 
  a 
  thickness 
  of 
  2*55 
  mm. 
  : 
  

  

  Table 
  III. 
  

  

  minutes. 
  

  

  D. 
  

  

  r, 
  

   ohms. 
  

  

  i 
  

  

  2 
  

  

  153 
  

  

  101,000 
  

  

  H 
  

  

  74 
  

  

  236 
  

  

  Reversed. 
  

  

  

  

  5| 
  

  

  86 
  

  

  203 
  

  

  6 
  

  

  93 
  

  

  188 
  

  

  8> 
  2 
  

  

  134 
  

  

  131 
  

  

  1 
  £7 
  2 
  

  

  131 
  

  

  133 
  

  

  15 
  

  

  85 
  

  

  206 
  

  

  Eeversed. 
  

  

  

  

  15i 
  

  

  96 
  

  

  182 
  

  

  15| 
  

  

  110 
  

  

  159 
  

  

  m 
  

  

  145 
  

  

  121 
  

  

  22^ 
  

  

  102 
  

  

  171 
  

  

  Eeversed. 
  

  

  

  

  22f 
  

  

  118 
  

  

  148 
  

  

  23 
  

  

  139 
  

  

  126 
  

  

  23A 
  

  

  144 
  

  

  121 
  

  

  The 
  same 
  results 
  were 
  obtained 
  after 
  distilling 
  the 
  aniline 
  

   and 
  thus 
  decreasing 
  its 
  conductivity 
  about 
  20 
  times. 
  

  

  These 
  figures 
  show 
  that 
  there 
  is 
  probably 
  considerable 
  

   polarization 
  of 
  the 
  electrodes, 
  or 
  else 
  some 
  change 
  in 
  the 
  

   liquid 
  which 
  is 
  reversed 
  with 
  the 
  current, 
  and 
  most 
  likely 
  

   takes 
  place 
  at 
  the 
  electrodes. 
  

  

  The 
  polarization 
  was 
  measured 
  in 
  some 
  cases, 
  just 
  after 
  

  

  