﻿lonkation 
  of 
  Electrolytic 
  Oxygen. 
  29 
  

  

  be 
  always 
  followed 
  with 
  fair 
  accuracy 
  and 
  that 
  occasional 
  

   observations 
  on 
  the 
  more 
  slowly 
  moving 
  particles 
  could 
  be 
  

   made. 
  

  

  If 
  V 
  is 
  the 
  velocity 
  with 
  which 
  a 
  particle 
  of 
  radius 
  a 
  falls 
  

   in 
  a 
  medium 
  whose 
  viscosity 
  is 
  77, 
  then 
  Stokes' 
  theorem 
  gives 
  

   the 
  equarion 
  

  

  4 
  IT 
  a,^g 
  = 
  Q'jrricxV, 
  

  

  If 
  an 
  electric 
  field 
  whose 
  gradient 
  is 
  X 
  units 
  per 
  cm. 
  is 
  

   acting, 
  and 
  if 
  the 
  particle 
  has 
  a 
  charge 
  of 
  E 
  units, 
  then 
  the 
  

   velocity 
  Y 
  with 
  which 
  it 
  falls 
  is 
  given 
  by 
  

  

  47ra^^ 
  + 
  EX 
  = 
  67r7;aV. 
  

  

  Combining 
  these 
  equations 
  we 
  get 
  

  

  E 
  = 
  

  

  IBttt; 
  /rjY' 
  

  

  v/ 
  

  

  2^ 
  

  

  oxygen 
  

  

  (V'-V). 
  

   at 
  about 
  

  

  15° 
  C. 
  as 
  

  

  Taking 
  the 
  viscosity 
  of 
  

   2*12 
  X 
  10-^ 
  this 
  reduces 
  to 
  

  

  E 
  = 
  3-94 
  X 
  10-6V'^ 
  (V'- 
  Y)^X. 
  

  

  In 
  the 
  following 
  table 
  X 
  is 
  given 
  in 
  E.S. 
  units 
  per 
  cm., 
  the 
  

   sign 
  refers 
  to 
  the 
  potential 
  of 
  the 
  upper 
  plate. 
  V 
  is 
  in 
  cms. 
  

   per 
  second 
  :■ 
  — 
  

  

  X. 
  

  

  YX10\ 
  

  

  Ex 
  10^°. 
  

  

  First 
  Set. 
  

  

  

  

  

  

  0-0 
  

  

  2-725 
  

  

  

  

  

  -0-067 
  

  

  3-087 
  

  

  

  —11-17 
  

  

  

  +0067 
  

  

  2-439 
  

  

  

  - 
  8-82 
  

  

  

  -0-133 
  

  

  2-500 
  

  

  + 
  3-48 
  

  

  

  

  +0-133 
  

  

  2-150 
  

  

  

  - 
  8-86 
  

  

  

  -0-200 
  

  

  3-030 
  

  

  -3-13 
  

  

  

  

  +0-200 
  

  

  1-852 
  

  

  

  - 
  8-99 
  

  

  

  -0-267 
  

  

  3-788 
  

  

  

  - 
  8-21 
  

  

  

  Second 
  set. 
  

  

  

  

  

  

  0-00 
  

  

  1-764 
  

  

  

  

  

  -0-0545 
  

  

  2-415 
  

  

  

  

  -19-76 
  

  

  -0-060(5 
  

  

  2-110 
  

  

  

  - 
  9-45 
  

  

  

  +0-0667 
  

  

  1-961 
  

  

  ±4-88 
  

  

  

  

  -0-0909 
  

  

  2-325 
  

  

  

  - 
  9-28 
  

  

  

  +0-1182 
  

  

  2174 
  

  

  +5-74 
  

  

  

  

  -0-1182 
  

  

  3-096 
  

  

  

  

  - 
  18 
  65 
  

  

  -01485 
  

  

  2-525 
  

  

  

  - 
  8 
  48 
  

  

  

  +0-1636 
  

  

  3-774 
  

  

  

  

  ±20-34 
  

  

  

  Mean 
  

  

  ±4-47 
  

  

  - 
  8-80 
  

  

  ±19-85 
  

  

  