﻿Gases 
  by 
  Collision 
  with 
  Low 
  Electric 
  Forces, 
  1035 
  

  

  to 
  the 
  gas-supply. 
  The 
  plate 
  B 
  was 
  surrounded 
  by 
  a 
  guard- 
  

   ring 
  GG, 
  earthed 
  through 
  the 
  brass 
  plate 
  HH 
  which 
  closed 
  

   the 
  upper 
  part 
  of 
  the 
  bell-jar. 
  From 
  B 
  a 
  brass 
  rod 
  F 
  passed 
  

   through 
  an 
  ebonite 
  plug 
  in 
  HH 
  and 
  was 
  connected 
  to 
  one 
  

   pair 
  of 
  quadrants 
  of 
  a 
  Dolezalek 
  electrometer, 
  the 
  other 
  pair 
  

   being 
  earthed. 
  

  

  Tier. 
  l. 
  

  

  Electrometer 
  

  

  «*«- 
  EARTH 
  

  

  WtEE^^EP 
  

  

  The 
  brass 
  plate 
  C 
  could 
  be 
  raised 
  or 
  lowered 
  by 
  means 
  of 
  

   a 
  screw 
  J 
  of 
  pitch 
  1 
  ram., 
  and 
  was 
  insulated 
  by 
  the 
  ebonite 
  

   pillars 
  KK 
  and 
  an 
  ebonite 
  extension 
  L. 
  M 
  was 
  a 
  circular 
  

   ebonite 
  disk 
  divided 
  into 
  ten 
  equal 
  parts 
  so 
  that 
  the 
  distance 
  

   between 
  the 
  plates 
  could 
  be 
  read 
  on 
  the 
  scale 
  accurately 
  

   to 
  more 
  than 
  a 
  tenth 
  of 
  a 
  millimetre. 
  M 
  was 
  turned 
  by 
  a 
  

   pin 
  passing 
  through 
  the 
  brass 
  plug 
  P, 
  below 
  which 
  was 
  a 
  

   brass 
  cistern 
  filled 
  with 
  vaseline. 
  This 
  rendered 
  the 
  apparatus 
  

   perfectly 
  airtight. 
  

  

  4 
  A 
  2 
  

  

  