﻿the 
  Conductivity 
  of 
  Liquids 
  in 
  Thin 
  Layers. 
  263 
  

  

  As 
  this 
  difference 
  might 
  be 
  due 
  to 
  the 
  rise 
  in 
  resistance 
  

   caused 
  by 
  the 
  current 
  immediately 
  after 
  starting 
  being 
  greater 
  

   with 
  the 
  thinner 
  layers 
  than 
  with 
  the 
  thicker 
  ones, 
  it 
  was 
  

   decided 
  to 
  try 
  the 
  effect 
  of 
  an 
  alternating 
  current, 
  and 
  the 
  

   second 
  method 
  of 
  measuring 
  the 
  resistance 
  was 
  used. 
  

  

  The 
  aniline 
  was 
  redistilled 
  and 
  the 
  plates 
  were 
  cleaned 
  with 
  

   alcohol 
  and 
  readjusted. 
  

  

  The 
  results 
  at 
  first 
  obtained 
  appeared 
  to 
  show 
  that 
  the 
  con- 
  

   ductivity 
  increased 
  as 
  the 
  thickness 
  of 
  the 
  layer 
  decreased. 
  

   But 
  it 
  was 
  found 
  that, 
  as 
  time 
  progressed,, 
  whilst 
  the 
  con- 
  

   ductivity 
  of 
  the 
  thinnest 
  layer 
  remained 
  practically 
  constant, 
  

   that 
  of 
  the 
  thicker 
  ones 
  gradually 
  increased 
  until 
  a 
  steady 
  state 
  

   was 
  reached, 
  when 
  it 
  was 
  nearly 
  the 
  same 
  for 
  all 
  layers. 
  

   This 
  is 
  shown 
  in 
  the 
  folio 
  wing 
  tables 
  : 
  — 
  

  

  E.M.F. 
  

  

  Table 
  VI. 
  

  

  10 
  volts. 
  Temp. 
  = 
  11°. 
  

  

  d, 
  

   mm. 
  

  

  Specific 
  Besistance 
  X 
  10 
  . 
  

  

  (1) 
  

  

  (2) 
  h\ 
  hours 
  

  

  (3) 
  29 
  hours 
  

  

  (4) 
  49 
  hours 
  

  

  

  after 
  (1). 
  

  

  after 
  (1). 
  

  

  after 
  (1). 
  

   37-9 
  

  

  •175 
  

  

  43-9 
  

  

  -334 
  

  

  39-9 
  

  

  42-5 
  

  

  44-8 
  

  

  34-0 
  

  

  •651 
  

  

  50-8 
  

  

  49-1 
  

  

  451 
  

  

  

  1-290 
  

  

  80-0 
  

  

  59i 
  

  

  452 
  

  

  37-4 
  

  

  2*55 
  

  

  123 
  

  

  74-0 
  

  

  450 
  

  

  

  510 
  

  

  165 
  

  

  69-5 
  

  

  44-2 
  

  

  

  1017 
  

  

  192 
  

  

  64-2 
  

  

  43-4 
  

  

  365 
  

  

  The 
  readings 
  in 
  the 
  fourth 
  column 
  are 
  one 
  set 
  out 
  of 
  a 
  large 
  

   number, 
  taken 
  on 
  the 
  same 
  day, 
  which 
  agreed 
  in 
  showing 
  that 
  

   the 
  conductivity 
  was 
  practically 
  the 
  same 
  for 
  all 
  layers. 
  

  

  The 
  aniline 
  was 
  redistilled 
  and 
  again 
  tested. 
  The 
  conduc- 
  

   tivity 
  was 
  now 
  much 
  less, 
  but 
  the 
  same 
  gradual 
  change 
  to 
  a 
  

   steady 
  state 
  was 
  found 
  to 
  occur. 
  

  

  Table 
  VII. 
  

   E.M.F. 
  = 
  10 
  volts. 
  0=11°. 
  

  

  d, 
  

   mm. 
  

  

  Specific 
  Eesistance, 
  C.Gr.S.xlO 
  -15 
  . 
  

  

  (1) 
  

  

  (2) 
  18 
  hours 
  

   after 
  (1). 
  

  

  (3) 
  40 
  hours 
  

   after 
  (1). 
  

  

  0175 
  

   •334 
  

   •651 
  

   1-29 
  

   2-55 
  

   510 
  

   10-17 
  

  

  105 
  

   111 
  

   130 
  

   159 
  

  

  209 
  

   242 
  

   263 
  

  

  124 
  

   127 
  

   133 
  

   139 
  

   143 
  

   147 
  

   147 
  

  

  114 
  

   107 
  

   111 
  

   108 
  

   110 
  

   112 
  

   112 
  

  

  1 
  

  

  