﻿Radium 
  Emanation 
  in 
  the 
  Atmosphere. 
  

  

  G01 
  

  

  For 
  the 
  day 
  runs 
  the 
  air-current 
  was 
  started 
  at 
  

   about 
  6 
  or 
  9 
  in 
  the 
  morning 
  and 
  left 
  on 
  till 
  about 
  5 
  or 
  7 
  in 
  

   the 
  evening. 
  The 
  average 
  current 
  was 
  about 
  *5 
  litre 
  per 
  

   minute. 
  The 
  results 
  are 
  stated 
  below 
  : 
  — 
  

  

  Table 
  VI. 
  

  

  

  

  

  Volume 
  

  

  Emanation 
  

  

  | 
  

  

  Date. 
  

  

  Night 
  

  

  Weather 
  and 
  

  

  of 
  Air 
  

   drawn 
  

  

  expressed 
  

   in 
  leak 
  in 
  

  

  Emanation 
  

   per 
  400 
  

  

  

  or 
  Day. 
  

  

  Barometer. 
  

  

  through, 
  

   in 
  litres. 
  

  

  div. 
  per 
  

  

  mil]. 
  

  

  litres 
  of 
  air.' 
  

  

  Apr. 
  7-8 
  ... 
  

  

  Night 
  

  

  Fine; 
  770, 
  

   falling. 
  

  

  550 
  

  

  •8 
  

  

  •6 
  

  

  „ 
  8-9 
  ... 
  

  

  

  Fine; 
  766, 
  

   falling. 
  

  

  521 
  

  

  21 
  

  

  1-6 
  

  

  May 
  6-7 
  ... 
  

  

  „ 
  

  

  Wet; 
  748, 
  

   rising. 
  

  

  414 
  

  

  •9 
  

  

  •9 
  

  

  „ 
  7-8 
  ... 
  

  

  

  Fine; 
  760, 
  

   steady. 
  

  

  378 
  

  

  •4 
  

  

  •4 
  

  

  „ 
  12 
  ... 
  

  

  Day 
  

  

  Wet 
  to 
  fine 
  ; 
  

   760. 
  falling. 
  

  

  315 
  

  

  1-8 
  

  

  24 
  

  

  „ 
  12-13 
  ... 
  

  

  Night 
  

  

  Fine; 
  758. 
  

  

  378 
  

  

  11 
  

  

  1-2 
  

  

  There 
  is 
  unfortunately 
  only 
  one 
  day 
  run 
  amongst 
  these, 
  but 
  

   its 
  result, 
  2*4 
  per 
  400 
  litres, 
  is 
  considerably 
  higher 
  than 
  the 
  

   highest 
  result 
  for 
  the 
  night 
  runs 
  and 
  more 
  than 
  twice 
  as 
  high 
  

   as 
  the 
  average 
  night 
  run. 
  Hence, 
  from 
  these 
  results 
  we 
  should 
  

   conclude 
  that 
  on 
  the 
  average 
  there 
  is 
  more 
  emanation 
  in 
  the 
  

   air 
  during 
  the 
  day 
  than 
  during 
  the 
  night. 
  

  

  Later 
  on, 
  however, 
  I 
  made 
  two 
  long 
  runs, 
  using 
  sulphuric 
  

   acid 
  as 
  the 
  dehydrator 
  with 
  the 
  following 
  results 
  : 
  — 
  

  

  Table 
  VI 
  L 
  

  

  Date. 
  

  

  Bun. 
  

  

  Weather 
  and 
  

   Barometer. 
  

  

  Volume 
  of 
  

   air 
  drawn 
  

   through. 
  

  

  Emanation 
  

   in 
  the 
  given 
  

   volume 
  of 
  air 
  

   expressed 
  in 
  

   terms 
  of 
  the 
  

   leak. 
  

  

  May 
  13-14... 
  Night 
  Fine 
  ; 
  755. 
  329 
  lit. 
  5 
  1 
  

  

  May 
  14 
  Day 
  Fine 
  ; 
  755. 
  302 
  „ 
  4'6 
  

  

  Emanation 
  

  

  per 
  400 
  

  

  litres 
  of 
  

  

  air. 
  

  

  6-2 
  

   61 
  

  

  So 
  that 
  in 
  this 
  case 
  the 
  amount 
  of 
  emanation 
  was 
  very 
  nearly 
  

   the 
  same 
  in 
  the 
  night 
  as 
  in 
  the 
  day 
  following. 
  The 
  barometer 
  

   was 
  very 
  steady 
  all 
  the 
  time. 
  

  

  