﻿Active 
  Deposit 
  of 
  Radiu 
  

  

  m 
  in 
  an 
  

  

  Electric 
  Field. 
  629 
  

  

  deposit 
  was 
  independent 
  of 
  the 
  amount 
  of 
  emanation 
  employed. 
  

   For 
  smaller 
  potentials 
  the 
  distribution 
  depends 
  considerably 
  

   on 
  the 
  amount 
  of 
  emanation 
  : 
  this 
  arises 
  from 
  the 
  fact 
  that 
  

   with 
  these 
  potentials 
  recombination 
  can 
  occur 
  between 
  the 
  

   positive 
  particles 
  and 
  negative 
  ions 
  which 
  are 
  produced 
  in 
  

   the 
  volume 
  of 
  the 
  gas, 
  whereas 
  for 
  the 
  larger 
  potentials 
  

   recombination 
  can 
  only 
  occur 
  to 
  any 
  appreciable 
  extent 
  with 
  

   negative 
  ions 
  which 
  are 
  present 
  in 
  the 
  same 
  column 
  as 
  the 
  

   active 
  particle. 
  

  

  A 
  number 
  of 
  experiments 
  were 
  performed 
  to 
  ascertain 
  in 
  

   what 
  manner 
  the 
  cathode 
  deposit 
  depended 
  upon 
  the 
  amount 
  

   of 
  emanation 
  for 
  any 
  applied 
  potential, 
  and 
  especially 
  to 
  see 
  

   whether 
  the 
  distribution 
  would 
  vary 
  in 
  the 
  same 
  way 
  as 
  the 
  

   ionization 
  current 
  which 
  passed 
  through 
  the 
  gas 
  during 
  the 
  

   exposure. 
  

  

  In 
  fig. 
  2 
  there 
  are 
  given 
  two 
  sets 
  of 
  curves 
  which 
  represent 
  

  

  Fisr. 
  2. 
  

  

  

  WOO 
  

  

  1 
  i 
  1 
  1 
  : 
  

  

  

  I-so 
  

  

  

  

  

  !&n 
  

  

  

  

  

  \ 
  

  

  

  

  Av 
  

  

  

  

  

  

  L 
  

  

  

  

  

  

  COnTiN^Ooo 
  CURv 
  

   BSOKtN 
  CUR\ 
  

  

  1 
  

  

  t&: 
  10N12 
  

   ta: 
  ACTIV 
  

  

  AT 
  ION 
  

   ITY 
  

  

  

  

  

  

  

  

  20 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  — 
  ^^ 
  

  

  

  

  

  

  **<^; 
  

  

  

  

  

  ...._ 
  

  

  

  

  

  

  

  \ 
  

  

  

  

  

  

  \ 
  K 
  A. 
  

  

  

  

  - 
  - 
  

  

  ~ 
  

  

  --„.. 
  

  

  

  

  

  

  

  

  

  

  ~ 
  - 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  *\ 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  l\ 
  

  

  s. 
  

  

  ~~ 
  — 
  . 
  

  

  

  

  \ 
  

  

  ^ 
  

  

  

  

  

  

  

  

  

  

  

  N 
  

  

  \l^ 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  2 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  10N12AT 
  

  

  ON 
  CJRS 
  

  

  NT 
  « 
  \U 
  

  

  VOLTS 
  : 
  

  

  160 
  

  

  

  

  the 
  results 
  obtained 
  in 
  this 
  series 
  of 
  experiments. 
  The 
  

   abscissae 
  represent 
  the 
  ionization 
  current 
  in 
  scale-divisions 
  

   per 
  sec. 
  (wuth 
  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, 
  

   Phil. 
  Mag. 
  S. 
  6. 
  Vol. 
  26. 
  No. 
  154. 
  Oct. 
  1913. 
  2 
  U 
  " 
  

  

  