﻿140 
  

  

  Mr. 
  John 
  S. 
  Townsend 
  on 
  Electrical 
  

  

  of 
  an 
  electrometer. 
  The 
  tube 
  insulated 
  in 
  the 
  manner 
  

   described 
  in 
  Section 
  10 
  was 
  used 
  in 
  these 
  experiments, 
  the 
  

   gas 
  examined 
  being 
  the 
  hydrogen 
  given 
  off 
  by 
  a 
  current 
  of 
  

   fourteen 
  amperes 
  from 
  a 
  dilute 
  sulphuric-acid 
  electrolyte. 
  

   The 
  following 
  deflexions 
  n, 
  and 
  n 
  2 
  were 
  obtained, 
  n 
  x 
  being 
  

   the 
  deflexion 
  per 
  minute 
  when 
  the 
  tube 
  is 
  connected 
  to 
  the 
  

   insulated 
  quadrants, 
  and 
  n 
  2 
  the 
  deflexion 
  per 
  minute 
  when 
  

   the 
  inductor 
  is 
  connected 
  to 
  the 
  insulated 
  quadrants: 
  — 
  

  

  n 
  v 
  

  

  n 
  2 
  . 
  

  

  16 
  

   95 
  

  

  47 
  

   36 
  

  

  The 
  relative 
  value 
  of 
  w 
  x 
  and 
  n 
  2 
  in 
  absolute 
  units 
  of 
  quantity 
  

  

  was 
  12 
  : 
  13'5, 
  so 
  that 
  ^^ 
  = 
  7^-- 
  

  

  p 
  to' 
  0YI2 
  

  

  We 
  thus 
  obtain 
  the 
  following 
  numbers 
  showing 
  the 
  con- 
  

   nexion 
  between 
  — 
  — 
  - 
  and 
  p 
  : 
  — 
  

   9 
  

  

  Po-P 
  

  

  p 
  

  

  Po- 
  

  

  Po-P 
  

   PPo 
  

  

  •30 
  

   •23 
  

  

  2X10- 
  3 
  

   1-46 
  xlO 
  -8 
  

  

  150 
  

   157 
  

  

  so 
  that 
  — 
  — 
  - 
  is 
  (within 
  5 
  per 
  cent.) 
  proportional 
  to 
  the 
  

  

  9 
  

   densities 
  of 
  the 
  electrification. 
  

  

  16. 
  Similar 
  values 
  were 
  obtained 
  for 
  p 
  — 
  p 
  and 
  p 
  for 
  the 
  

   oxygen 
  given 
  off 
  from 
  the 
  same 
  electrolyte 
  by 
  a 
  current 
  of 
  

   fourteen 
  amperes. 
  A 
  different 
  method 
  was 
  used 
  in 
  this 
  case, 
  

   which 
  did 
  not 
  require 
  an 
  inductor. 
  When 
  the 
  tube 
  C 
  

   (experiment, 
  Section 
  10) 
  was 
  being 
  filled 
  with 
  a 
  charged 
  

   gas, 
  which 
  enters 
  with 
  an 
  electrification 
  p 
  and 
  escapes 
  with 
  

   an 
  electrification 
  p, 
  the 
  quantity 
  p 
  — 
  -p 
  can 
  be 
  obtained 
  by 
  

   observing 
  the 
  rate 
  (w 
  x 
  per 
  minute) 
  at 
  which 
  the 
  spot 
  of 
  light 
  

   moves 
  on 
  the 
  electrometer-scale, 
  when 
  the 
  tube 
  is 
  full 
  of 
  

   the 
  charged 
  gas 
  and 
  the 
  stream 
  kept 
  running 
  through 
  it. 
  

   The 
  mean 
  density 
  of 
  electrification 
  in 
  the 
  tube 
  is 
  practically 
  

  

  