﻿562 
  

  

  Prof. 
  J. 
  S. 
  Town 
  send 
  on 
  the 
  Conductivity 
  

  

  The 
  tables 
  correspond 
  to 
  the 
  different 
  pressures. 
  The 
  force 
  

   X 
  is 
  given 
  in 
  volts 
  per 
  centimetre. 
  The 
  conductivities 
  n 
  x 
  n 
  2 
  , 
  

   n 
  3 
  , 
  &c. 
  are 
  the 
  electrometer 
  deflexions 
  obtained 
  in 
  10 
  seconds, 
  

   and 
  corrected 
  for 
  capacity 
  as 
  explained, 
  the 
  suffix 
  denoting 
  

   the 
  distance 
  between 
  the 
  plates 
  in 
  millimetres. 
  The 
  ratio 
  of 
  

   each 
  conductivity 
  to 
  the 
  preceding 
  is 
  given 
  in 
  the 
  column 
  E. 
  

   It 
  is 
  not 
  necessary 
  to 
  have 
  the 
  same 
  intensity 
  of 
  light 
  for 
  the 
  

   experiments 
  at 
  different 
  pressures 
  and 
  forces, 
  so 
  that 
  in 
  the 
  

   tables 
  of 
  results 
  the 
  numbers 
  in 
  the 
  vertical 
  columns 
  do 
  not 
  

   accurately 
  correspond 
  to 
  equal 
  intensities 
  of 
  light. 
  

  

  Table 
  I. 
  — 
  Air. 
  Pressure 
  6 
  mm^ 
  

  

  X. 
  

  

  %. 
  

  

  » 
  a 
  . 
  

  

  n 
  5 
  . 
  

  

  E, 
  

  

  350 
  

  

  169 
  

  

  19-2 
  

  

  222 
  

  

  1-14, 
  1-14 
  

  

  525 
  

  

  20-7 
  

  

  37-5 
  

  

  69 
  

  

  1-81, 
  1-84 
  

  

  700 
  

  

  28-2 
  

  

  97-5 
  

  

  345 
  

  

  3-47, 
  3-53 
  

  

  Table 
  II. 
  — 
  Air. 
  Pressure 
  2*5 
  mms. 
  

  

  X. 
  

  

  n 
  v 
  

  

  n 
  3 
  . 
  

  

  n- 
  . 
  

  

  E. 
  

  

  350 
  

  

  23 
  

  

  47-5 
  

  

  97-2 
  

  

  206, 
  205 
  

  

  525 
  

  

  29-7 
  

  

  126 
  

  

  547 
  

  

  4-24, 
  4-31 
  

  

  700 
  

  

  37-3 
  

  

  312 
  

  

  

  8;56 
  — 
  

  

  Table 
  III. 
  — 
  Air. 
  Pressure 
  1*04 
  mms. 
  

  

  X. 
  

  

  n 
  v 
  

  

  n 
  3 
  . 
  

  

  n-. 
  

  

  E. 
  

  

  262 
  

  

  27-6 
  

  

  57 
  

  

  121 
  

  

  2-06, 
  212 
  

  

  350 
  

  

  31-5 
  

  

  86 
  

  

  241 
  

  

  2-73, 
  2-80 
  

  

  438 
  

  

  40 
  

  

  140 
  

  

  518 
  

  

  3-5, 
  3-7 
  

  

  