﻿Active 
  Deposit 
  of 
  Radium 
  in 
  an 
  Electric 
  Field. 
  625 
  

  

  the 
  ionization 
  current 
  were 
  made 
  ; 
  this 
  device 
  enabled 
  the 
  

   range 
  of 
  swing 
  of 
  the 
  electrometer-needle 
  to 
  be 
  so 
  adjusted 
  

   that 
  its 
  mid-point 
  coincided 
  with 
  the 
  zero 
  of 
  the 
  instrument, 
  

  

  Kff. 
  1. 
  

  

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  &ZZZZZZZZZZEZ 
  

  

  C 
  

  

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  zzzazzzzzzzzzzzzza 
  

  

  WvWMWWVW- 
  

  

  a 
  precaution 
  which 
  was 
  especially 
  necessary 
  when 
  the 
  

   applied 
  potential 
  was 
  small. 
  Reference 
  should 
  be 
  made 
  to 
  

   the 
  previous 
  paper 
  for 
  a 
  more 
  detailed 
  account 
  of 
  the 
  apparatus 
  

   and 
  method 
  of 
  procedure. 
  

  

  Experiments 
  with 
  a 
  Cylindrical 
  Condenser 
  of 
  Small 
  Diameter. 
  

  

  3. 
  In 
  the 
  previous 
  experiments 
  the 
  greatest 
  amount 
  of 
  

   active 
  deposit 
  that 
  settled 
  on 
  the 
  cathode 
  was 
  about 
  90 
  per 
  

   cent, 
  of 
  the 
  total; 
  this 
  occurred 
  for 
  a 
  potential 
  of 
  4000 
  volts. 
  

   It 
  was 
  of 
  interest 
  to 
  ascertain 
  the 
  effect 
  of 
  applying 
  a 
  large 
  

   potential 
  across 
  a 
  smaller 
  distance 
  so 
  as 
  to 
  obtain 
  very 
  large 
  

   values 
  for 
  the 
  electric 
  field. 
  For 
  this 
  purpose 
  two 
  cylindrical 
  

   vessels 
  were 
  constructed 
  of 
  the 
  following 
  dimensions: 
  — 
  

  

  Height 
  140 
  mm. 
  

  

  Inner 
  diameter 
  19 
  „ 
  

  

  Length 
  of 
  central 
  electrode 
  

  

  101 
  

  

  