﻿the 
  Conductivity 
  of 
  Liquids 
  in 
  Thin 
  Layers. 
  267 
  

  

  Condition 
  (1) 
  is 
  fulfilled 
  by 
  attaching 
  the 
  upper 
  plate 
  A 
  

   to 
  a 
  steel 
  rod 
  r 
  which 
  slides 
  without 
  turning 
  in 
  the 
  two 
  

   v% 
  v 
  x 
  v 
  2 
  . 
  

  

  Fk. 
  5. 
  

  

  VS 
  

  

  3 
  

  

  Diagram 
  of 
  Second 
  Form 
  of 
  Apparatus. 
  \ 
  nat. 
  size. 
  

  

  Condition 
  (2) 
  is 
  fulfilled 
  thus 
  : 
  — 
  The 
  shaft 
  of 
  the 
  upper 
  

   plate 
  has 
  a 
  \ 
  in. 
  hole 
  bored 
  in 
  it, 
  and 
  slips 
  without 
  shake 
  on 
  to 
  

   the 
  reduced 
  end 
  of 
  the 
  steel 
  rod 
  r, 
  and 
  is 
  fixed 
  by 
  a 
  set-screw 
  

   which 
  screws 
  into 
  a 
  small 
  hole 
  in 
  the 
  rod 
  and 
  draws 
  the 
  shaft 
  

   tight 
  up 
  against 
  the 
  shoulder 
  at 
  the 
  same 
  time. 
  The 
  lower 
  

   plate 
  B 
  screws 
  on 
  to 
  an 
  ebonite 
  rod 
  e 
  ± 
  which 
  is 
  attached 
  by 
  

   means 
  of 
  the 
  iron 
  screw 
  s 
  ± 
  to 
  the 
  iron 
  plate 
  P 
  x 
  ; 
  s 
  i 
  passes 
  

   through 
  a 
  hole 
  much 
  larger 
  than 
  itself 
  so 
  as 
  to 
  admit 
  of 
  some 
  

   lateral 
  adjustment. 
  The 
  plate 
  Pj 
  is 
  fixed 
  laterally 
  by 
  the 
  

   three 
  levelling-screws 
  which 
  rest, 
  by 
  hole 
  slot 
  and 
  plane, 
  on 
  

  

  