﻿the 
  Conductivity 
  of 
  Liquids 
  in 
  Thin 
  Layers, 
  265 
  

  

  upper 
  plate 
  was 
  screwed 
  down 
  one-tenth 
  of 
  its 
  distance 
  from 
  

   the 
  lower 
  plate 
  and 
  the 
  resistance 
  again 
  measured. 
  The 
  

   plate 
  was 
  then 
  brought 
  back 
  to 
  its 
  original 
  position, 
  and 
  one- 
  

   tenth 
  above 
  it, 
  the 
  resistance 
  being 
  measured 
  in 
  each 
  case. 
  

   This 
  series 
  was 
  repeated 
  several 
  times 
  and 
  the 
  differences 
  

   between 
  consecutive 
  readings 
  gave 
  the 
  resistance 
  of 
  a 
  layer 
  

   equal 
  to 
  one-tenth 
  the 
  distance 
  between 
  the 
  plates. 
  

  

  From 
  the 
  mean 
  of 
  these 
  differences 
  was 
  calculated 
  the 
  

   resistance 
  of 
  a 
  layer 
  equal 
  to 
  one 
  turn 
  of 
  the 
  screw 
  (1*27 
  mm.) 
  . 
  

   Thus, 
  at 
  the 
  position 
  d 
  = 
  '5 
  turn, 
  the 
  readings 
  were 
  : 
  — 
  • 
  

  

  Table 
  IX. 
  

  

  d, 
  turns. 
  

  

  r. 
  ohms. 
  

  

  Differences. 
  

  

  •50 
  

   •55 
  

   •50 
  

   •45 
  

   •50 
  

   •55 
  

   •50 
  

   •45 
  

   •50 
  

  

  202-5 
  

  

  219 
  

  

  202-5 
  

  

  185-5 
  

  

  202-5 
  

  

  220 
  

  

  2015 
  

  

  183-6 
  

  

  200 
  

  

  16-5 
  

   165 
  

  

  170 
  

   17-0 
  

   17-5 
  

   18-5 
  

   17 
  9 
  

   16-4 
  

  

  

  

  1716 
  mean 
  resistance 
  

   of 
  0-05 
  turn. 
  

  

  1 
  

  

  Whence 
  resistance 
  of 
  1 
  turn 
  = 
  343*2 
  ohms. 
  

   The 
  mean 
  values 
  for 
  all 
  positions 
  were 
  : 
  — 
  

  

  Table 
  X. 
  — 
  Distilled 
  Water. 
  

  

  

  

  Resistance 
  of 
  

  

  d, 
  turns. 
  

  

  d, 
  mm. 
  

  

  1 
  turn 
  at 
  

   each 
  position. 
  

  

  •1 
  

  

  •127 
  

  

  357 
  

  

  •3 
  

  

  •381 
  

  

  363 
  

  

  •5 
  

  

  •635 
  

  

  343 
  

  

  1-0 
  

  

  1-27 
  

  

  340 
  

  

  2-0 
  

  

  2-54 
  

  

  353 
  

  

  4-0 
  

  

  5-08 
  

  

  349 
  

  

  7-0 
  

  

  8-89 
  

  

  343 
  

  

  

  

  349-7 
  mean. 
  

  

  The 
  greatest 
  difference 
  from 
  the 
  mean 
  is 
  about 
  4 
  per 
  cent., 
  

   and 
  the 
  mean 
  is 
  about 
  1 
  per 
  cent, 
  greater 
  than 
  that 
  in 
  

   Table 
  VIII. 
  

  

  