﻿Radium 
  Emanation 
  

  

  The 
  

  

  air 
  results 
  agree 
  

   before. 
  As 
  in 
  the 
  former 
  

  

  the 
  Atmosphere. 
  Gil 
  

  

  but 
  are 
  less 
  than 
  

   a 
  solitary 
  high 
  

  

  better 
  this 
  time 
  

   in 
  trie 
  tormer 
  table 
  there 
  is 
  

   result 
  for 
  the 
  air 
  and 
  solution 
  together. 
  Still 
  there 
  was 
  only 
  

   oue 
  reason 
  why 
  it 
  should 
  be 
  omitted, 
  namely, 
  that 
  during 
  the 
  

   three-hour 
  wait 
  it 
  only 
  increased 
  in 
  the 
  ratio 
  1 
  to 
  1*1 
  whereas 
  

   the 
  most 
  usual 
  ratio 
  was 
  1 
  to 
  1'4 
  or 
  1*5. 
  From 
  the 
  mean 
  

   results 
  of 
  this 
  table 
  the 
  amount 
  of 
  radium 
  necessary 
  to 
  supply 
  

   one 
  cub. 
  m. 
  with 
  emanation 
  would 
  be 
  

  

  1000 
  

   75 
  

  

  •o 
  

   ?7 
  X 
  

  

  3-14x10- 
  

   51 
  

  

  or 
  90 
  x 
  10- 
  12 
  orm. 
  of 
  Radium. 
  

  

  In 
  the 
  case 
  of 
  the 
  results 
  with 
  the 
  condenser 
  I 
  have 
  not 
  

   been 
  able 
  to 
  find 
  any 
  correlation 
  between 
  the 
  amount 
  of 
  

   emanation 
  in 
  the 
  air 
  and 
  the 
  barometric 
  and 
  weather 
  

   changes. 
  

  

  Third 
  Set 
  of 
  Runs 
  ivith 
  the 
  Condenser. 
  

  

  In 
  this 
  third 
  set 
  calcium 
  chloride 
  was 
  not 
  used 
  as 
  a 
  

   dehydrator. 
  In 
  the 
  first 
  experiment 
  the 
  spiral 
  of 
  composition 
  

   tubing 
  immersed 
  in 
  ice 
  and 
  salt 
  was 
  used, 
  in 
  the 
  others 
  

   sulphuric 
  acid 
  was 
  used 
  as 
  the 
  dehydrator. 
  The 
  results 
  vary 
  

   much 
  among 
  themselves. 
  The 
  result 
  obtained 
  with 
  the 
  

   " 
  compo 
  " 
  tube 
  is 
  very 
  high, 
  and 
  I 
  thought 
  at 
  first 
  it 
  must 
  be 
  

   due 
  to 
  emanation 
  given 
  off 
  by 
  the 
  lead. 
  Mr. 
  N. 
  R. 
  Campbell 
  

   informs 
  me, 
  however, 
  that 
  lead 
  gives 
  off 
  no 
  emanation. 
  If 
  

   the 
  spiral 
  had 
  been 
  used 
  before 
  in 
  radioactive 
  work 
  it 
  may 
  

   have 
  got 
  contaminated. 
  It, 
  however, 
  appeared 
  quite 
  new 
  

  

  Table 
  XII. 
  

  

  

  

  

  

  

  

  

  Leak 
  due 
  to 
  

  

  Date. 
  

  

  Weather 
  and 
  

   Barometer. 
  

  

  Source 
  

  

  of 
  

   Emana- 
  

   tion. 
  

  

  Time 
  of 
  

   passing 
  the 
  

   Air 
  Stream. 
  

  

  Volume 
  

   of 
  Air 
  

   passed. 
  

  

  Total 
  

   imme- 
  

   diate 
  

   Leak. 
  

  

  Air 
  

   Leak. 
  

  

  Emanation. 
  

  

  

  T 
  3 
  hrs. 
  

   J™H 
  after- 
  

   diatel 
  y 
  wards. 
  

  

  May. 
  

  

  

  

  P.M. 
  

  

  litres, 
  

  

  

  

  

  

  Tues. 
  12 
  . 
  

  

  Fine 
  ; 
  759, 
  falling. 
  

  

  Air. 
  

  

  1.49-4.13 
  

   144 
  m. 
  

  

  57 
  

  

  5-0 
  

  

  1-4 
  

  

  36 
  

  

  5-4 
  

  

  Wed. 
  13 
  . 
  

  

  Thundery; 
  756, 
  

   falling. 
  

  

  Air. 
  

  

  1.1-3.57 
  

   176 
  m. 
  

  

  89 
  

  

  41 
  

  

  1-2 
  

  

  2-9 
  

  

  3-7 
  

  

  Fri. 
  15 
  ... 
  

  

  Wet 
  ; 
  755, 
  rising. 
  

  

  Air 
  

  

  4- 
  Sol. 
  

  

  12.57-4.57 
  

   240 
  m. 
  

  

  126 
  

  

  125 
  

  

  12 
  

  

  11-3 
  

  

  

  Sat. 
  16 
  ... 
  

  

  Fine 
  ; 
  768, 
  rising. 
  

  

  Air. 
  

  

  2.45-5.15 
  

   150 
  m. 
  

  

  75 
  

  

  1-8 
  

  

  11 
  

  

  •7 
  

  

  

  Sat. 
  16 
  ... 
  

  

  Fine 
  ; 
  768, 
  rising. 
  

  

  Air 
  

  

  4-Sol. 
  

  

  7.0-9.15 
  

   115 
  m. 
  

  

  67 
  

  

  5-7 
  

  

  1-0 
  

  

  ! 
  

  

  47 
  

  

  

  2 
  S 
  2 
  

  

  