﻿362 
  Prof. 
  Richardson 
  and 
  Mr. 
  Brown 
  on 
  the 
  Kinetic 
  

  

  The 
  whole 
  of 
  this 
  portion 
  of 
  the 
  apparatus 
  was 
  enclosed 
  

   by 
  a 
  glass 
  tube 
  C, 
  so 
  that 
  any 
  desired 
  degree 
  of 
  evacuation 
  

   could 
  be 
  obtained. 
  The 
  bottom 
  of 
  this 
  tube 
  was 
  ground 
  flat 
  

   and 
  rested 
  in 
  a 
  groove 
  in 
  the 
  base-plate, 
  to 
  which 
  it 
  was 
  

   joined 
  with 
  sealing-wax 
  done 
  over 
  with 
  soft 
  wax. 
  All 
  

   sealing-wax 
  joints 
  were 
  made 
  air-tight 
  in 
  this 
  way. 
  The 
  

   platinum 
  wires 
  E 
  x 
  and 
  E 
  2 
  were 
  of 
  course 
  fused 
  into 
  the 
  

   glass. 
  An 
  outlet 
  tube 
  connected 
  with 
  the 
  mercury-pump, 
  

   McLeod 
  gauge, 
  drying-apparatus, 
  and 
  tap 
  for 
  letting 
  in 
  gases. 
  

   The 
  drying 
  agent 
  used 
  was 
  phosphorus 
  pentoxide 
  redistilled 
  

   in 
  oxygen. 
  In 
  order 
  to 
  make 
  certain 
  that 
  effects 
  were 
  not 
  

   being 
  caused 
  by 
  charges 
  accumulating 
  on 
  the 
  glass 
  the 
  upper 
  

   plate 
  and 
  the 
  wire 
  leading 
  from 
  it 
  were 
  shielded 
  by 
  the 
  

   flanged 
  brass 
  tube 
  S. 
  This 
  was 
  connected 
  to 
  the 
  guard-ring 
  

   and 
  also 
  to 
  earth 
  by 
  means 
  of 
  the 
  extensible 
  wire 
  E 
  2 
  . 
  It 
  

   will 
  be 
  seen 
  that 
  the 
  system 
  was 
  very 
  thoroughly 
  protected 
  

   from 
  any 
  effects 
  which 
  might 
  arise 
  from 
  charging 
  up 
  of 
  

   insulation. 
  

  

  The 
  particular 
  design 
  of 
  apparatus 
  was 
  adopted 
  so 
  that 
  

   it 
  might 
  very 
  readily 
  be 
  taken 
  apart 
  and 
  a 
  new 
  platinum 
  

   strip 
  substituted 
  whenever 
  that 
  became 
  desirable. 
  It 
  was 
  

   admirable 
  from 
  that 
  point 
  of 
  view. 
  

  

  The 
  detailed 
  construction 
  of 
  the 
  two 
  plates 
  is 
  shown 
  in 
  

   fig. 
  3. 
  The 
  three 
  ebonite 
  pieces 
  which 
  served 
  to 
  insulate 
  the 
  

  

  Fig. 
  3. 
  

   ( 
  — 
  i 
  — 
  i 
  1 
  1 
  1 
  « 
  — 
  . 
  — 
  " 
  " 
  — 
  i 
  

  

  » 
  'o 
  Centimeters 
  

  

  Upper 
  plate 
  and 
  guard 
  r/a/g 
  

  

  lOWRR 
  PL/iT£ 
  

  

  upper 
  plate 
  from 
  the 
  guard 
  -ring 
  and 
  the 
  lower 
  plate, 
  and 
  

   also 
  to 
  support 
  both 
  on 
  the 
  lower 
  plate, 
  are 
  denoted 
  by 
  e. 
  

   The 
  plan 
  of 
  the 
  lower 
  plate 
  shows 
  the 
  square 
  hole 
  where 
  the 
  

   hot 
  strip 
  came 
  up 
  flush 
  with 
  the 
  surface. 
  The 
  two 
  sections 
  

   show 
  the 
  way 
  in 
  which 
  the 
  platinum 
  strip 
  was 
  supported. 
  

   The 
  mica 
  insulating 
  strips 
  are 
  denoted 
  by 
  m. 
  A 
  sheet 
  of 
  

  

  