﻿682 
  

  

  Prof. 
  0. 
  W. 
  Kichardson 
  on 
  the 
  Kinetic 
  

  

  that 
  difficulties 
  of 
  that 
  character 
  have 
  been 
  overcome, 
  and 
  

   the 
  theory 
  has 
  been 
  subjected 
  to 
  a 
  much 
  more 
  exact 
  test 
  

   than 
  before. 
  The 
  following 
  experiments 
  form 
  a 
  very 
  satis- 
  

   factory 
  confirmation 
  of 
  the 
  theory, 
  but 
  only 
  under 
  certain 
  

   rather 
  restricted 
  conditions. 
  It 
  will 
  be 
  seen 
  that 
  under 
  

   certain 
  other 
  conditions^ 
  which 
  will 
  be 
  considered 
  later, 
  the 
  

   curves 
  obtained 
  are 
  not 
  at 
  all 
  what 
  was 
  expected. 
  The 
  dis- 
  

   crepancy, 
  however, 
  is 
  probably 
  due 
  to 
  causes 
  lying 
  outside 
  

   of 
  the 
  present 
  theory. 
  

  

  The. 
  Apparatus 
  used. 
  

  

  The 
  apparatus 
  previously 
  used 
  has 
  already 
  been 
  fully 
  

   described 
  *^ 
  so 
  that 
  it 
  will 
  only 
  be 
  necessary 
  to 
  specify 
  the 
  

   changes 
  which 
  have 
  been 
  made. 
  The 
  essential 
  parts 
  are 
  

   shown 
  in 
  detail 
  in 
  figs. 
  1 
  and 
  2, 
  in 
  which 
  the 
  same 
  parts 
  are 
  

  

  Ym. 
  1. 
  

  

  denoted 
  by 
  common 
  letters. 
  These 
  figures 
  are 
  drawn 
  to 
  

   scale, 
  natural 
  size, 
  and 
  represent 
  respectively 
  sections 
  by 
  

   vertical 
  and 
  horizontal 
  planes 
  perpendicular 
  to 
  the 
  conducting 
  

   planes 
  A 
  and 
  B. 
  The 
  latter 
  were 
  the 
  surfaces 
  of 
  brass 
  plates 
  

   of 
  the 
  thickness 
  shown 
  ; 
  their 
  length, 
  which 
  is 
  not 
  shown 
  by 
  

   the 
  figures, 
  was 
  about 
  20 
  cm., 
  and 
  they 
  were 
  insulated 
  from 
  

   each 
  other 
  by 
  hard 
  rubber 
  blocks, 
  into 
  which 
  they 
  were 
  

  

  * 
  Phil. 
  Mag. 
  [6] 
  xvi. 
  p. 
  740 
  (1908). 
  

  

  