﻿of 
  Radium 
  in 
  an 
  Electric 
  Field. 
  

  

  321 
  

  

  In 
  fig. 
  2 
  there 
  are 
  given 
  two 
  sets 
  of 
  curves, 
  which 
  rep- 
  

   resent 
  the 
  results 
  obtained 
  in 
  this 
  series 
  of 
  experiments. 
  

   The 
  abscissae 
  represent 
  the 
  ionization 
  current 
  in 
  scale 
  divi- 
  

   sions 
  per 
  sec 
  (with 
  added 
  capacity) 
  due 
  to 
  the 
  emanation 
  and 
  

   active 
  deposit 
  in 
  equilibrium 
  when 
  a 
  positive 
  potential 
  of 
  

   160 
  volts 
  was 
  applied 
  to 
  the 
  case. 
  Inasmuch 
  as 
  this 
  potential 
  

   afforded 
  the 
  same 
  percentage 
  (viz. 
  94*3) 
  of 
  the 
  saturation 
  

   current 
  whatever 
  amount 
  of 
  emanation 
  was 
  employed, 
  the 
  

   abscissse 
  (denoted 
  by 
  I 
  160 
  ) 
  serve 
  as 
  a 
  measure 
  of 
  the 
  saturation 
  

   current. 
  

  

  Fig. 
  2. 
  

  

  J.W 
  

  

  

  

  

  

  

  1000 
  

  

  

  

  1 
  

  

  

  1 
  

  

  J.00 
  

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  Il60 
  

  

  

  

  

  

  160 
  

  

  

  

  

  

  

  

  

  

  Av 
  

   Ai60 
  

  

  

  

  

  40 
  

  

  

  

  

  

  CONTINUOUS 
  CURVES: 
  lONli 
  

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  CURVES 
  : 
  ACTI\ 
  

  

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  ^=-^ 
  

  

  

  

  

  

  

  

  

  2 
  

  

  

  

  

  

  

  

  

  

  10 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  10NIZAT 
  

  

  ON 
  CURRE 
  

  

  NT 
  AT 
  16( 
  

  

  VOLTS 
  : 
  

  

  160 
  

  

  

  

  :.oo 
  

  

  3.00 
  

  

  4.00 
  

  

  5.00 
  

  

  7.00 
  

  

  The 
  continuous 
  curves 
  in 
  fig. 
  2 
  have 
  as 
  ordinates 
  I 
  v 
  /I 
  160 
  , 
  

   i. 
  e., 
  the 
  value 
  of 
  the 
  current 
  obtained 
  with 
  Y 
  volts 
  applied 
  to 
  

   the 
  case 
  expressed 
  as 
  a 
  fraction 
  of 
  the 
  current 
  obtained 
  when 
  

   160 
  volts 
  were 
  applied. 
  

  

  The 
  broken 
  curves 
  refer 
  to 
  the 
  active 
  deposit 
  and 
  have 
  as 
  

   ordinates 
  A 
  v 
  /A 
  160 
  , 
  i. 
  e., 
  the 
  cathode 
  deposit 
  obtained 
  with 
  Y 
  

   volts 
  applied 
  to 
  the 
  case 
  expressed 
  as 
  a 
  fraction 
  of 
  the 
  cathode 
  

   deposit 
  obtained 
  when 
  a 
  positive 
  potential 
  of 
  160 
  volts 
  was 
  ap- 
  

   plied. 
  As 
  mentioned 
  above, 
  the 
  cathode 
  deposit 
  obtained 
  for 
  

   a 
  potential 
  of 
  160 
  volts 
  was 
  only 
  83*9 
  per 
  cent 
  of 
  the 
  total 
  

   amount, 
  and 
  the 
  maximum 
  amount 
  obtainable 
  on 
  the 
  cathode 
  

   for 
  very 
  large 
  potentials 
  was 
  89*2 
  per 
  cent 
  of 
  the 
  total. 
  

  

  