﻿256 
  

  

  Mr. 
  G. 
  B. 
  Bryan 
  on 
  the 
  Determination 
  of 
  

  

  answer 
  the 
  purpose 
  very 
  well. 
  It 
  is 
  shown 
  in 
  fig. 
  1. 
  The 
  

   micrometer-screw 
  S 
  carries 
  two 
  parallel 
  brass 
  plates 
  p 
  h 
  p 
  2 
  ; 
  

   px 
  is 
  fixed 
  at 
  right 
  angles 
  to 
  the 
  screw, 
  and 
  p 
  2 
  attached 
  to 
  pi 
  

   by 
  three 
  adjusting 
  screws 
  s^^i 
  round 
  the 
  circumference. 
  

   From 
  p 
  2 
  is 
  suspended 
  the 
  upper 
  electrode 
  A, 
  by 
  means 
  of 
  a 
  

   glass 
  rod 
  g 
  Y 
  . 
  

  

  Fig. 
  1. 
  

  

  Diagram 
  of 
  First 
  Form 
  of 
  Apparatus. 
  \ 
  rat. 
  size. 
  

  

  To 
  the 
  iron 
  base-plate 
  P 
  is 
  attached 
  a 
  vertical 
  glass 
  rod 
  g 
  2 
  , 
  

   which 
  carries 
  two 
  brass 
  plates 
  p 
  5l 
  p± 
  connected 
  together 
  by 
  

   adjusting 
  screws 
  s 
  2 
  s 
  2 
  s 
  2 
  similarly 
  to 
  the 
  plates 
  p 
  ly 
  p 
  2 
  . 
  p 
  3 
  is 
  

   another 
  brass 
  plate 
  connected 
  to 
  p 
  4 
  by 
  the 
  glass 
  rod 
  g 
  3 
  , 
  and 
  on 
  

   this 
  plate 
  is 
  placed 
  the 
  glass 
  vessel 
  V 
  which 
  contains 
  the 
  

   lower 
  electrode 
  B, 
  resting 
  on 
  three 
  glass 
  points. 
  The 
  glass 
  

   vessel 
  is 
  covered 
  by 
  an 
  ebonite 
  plate 
  T 
  which 
  fits 
  loosely 
  

  

  