﻿Active 
  Deposit 
  of 
  Actinium 
  in 
  Electric 
  Fields, 
  393 
  

  

  -emanation 
  entering 
  the 
  cylinder 
  from 
  active 
  deposit. 
  In 
  

   order 
  that 
  the 
  emanation 
  in 
  H 
  might 
  grow 
  again 
  to 
  its 
  

   •equilibrium 
  value 
  after 
  the 
  expansion 
  of 
  the 
  air 
  into 
  M, 
  a 
  

   minute 
  was 
  allowed 
  to 
  elapse 
  between 
  the 
  commencement 
  

   of 
  the 
  expansion 
  and 
  the 
  inrush 
  of 
  air. 
  Time 
  was 
  measured 
  

   from 
  the 
  instant 
  of 
  opening 
  the 
  tap 
  T. 
  

  

  

  The 
  emanation 
  was 
  allowed 
  to 
  transform 
  into 
  the 
  deposit 
  

   products 
  for 
  given 
  intervals 
  of 
  time 
  after 
  its 
  introduction, 
  the 
  

   tube 
  F 
  was 
  then 
  suddenly 
  lowered, 
  kept 
  down 
  four 
  seconds, 
  

   and 
  raised 
  again. 
  The 
  active 
  wire 
  was 
  removed, 
  and 
  ten 
  

   minutes 
  after 
  the 
  introduction 
  of 
  the 
  emanation 
  its 
  activity 
  

   was 
  measured 
  with 
  a 
  very 
  sensitive 
  a-ray 
  electroscope. 
  If 
  

   the 
  wire 
  were 
  earthed 
  during 
  the 
  exposure, 
  the 
  activity 
  was 
  

  

  