﻿6.12 
  

  

  Mr. 
  J. 
  Satterly 
  on 
  the 
  Amount 
  of 
  

  

  and 
  unused, 
  but 
  the 
  workshop 
  mechanic 
  could 
  not 
  guarantee 
  

   its 
  virginity. 
  Therefore, 
  either 
  (1) 
  there 
  was 
  an 
  excessive 
  

   amount 
  of 
  emanation 
  in 
  the 
  air 
  that 
  day, 
  (2) 
  lead 
  does 
  give 
  

   off 
  an 
  emanation, 
  or 
  (3) 
  the 
  tube 
  was 
  contaminated 
  with 
  

   radium. 
  I 
  have 
  not 
  tested 
  the 
  last 
  two 
  points. 
  

  

  Expressing 
  the 
  results 
  as 
  before 
  we 
  get 
  Table 
  X1I1. 
  

  

  Table 
  XIII. 
  

  

  Date. 
  

  

  75 
  litres 
  of 
  Air. 
  

  

  75 
  litres 
  Air 
  and 
  

   2jj 
  hours 
  of 
  Solution. 
  

  

  May 
  12 
  

  

  4-7 
  

   2-4 
  

  

  '7 
  

  

  7-1 
  

   52 
  

  

  „ 
  13 
  

  

  „ 
  15 
  

  

  „ 
  16 
  

  

  

  Little 
  can 
  be 
  done 
  with 
  the 
  huge 
  result 
  of 
  May 
  12. 
  The 
  

   result 
  of 
  May 
  13 
  is 
  also 
  very 
  high, 
  but 
  if 
  we 
  assume 
  that 
  as 
  

   the 
  barometer 
  remained 
  fairly 
  steady 
  all 
  the 
  time 
  the 
  

   emanation 
  in 
  the 
  air 
  would 
  remain 
  the 
  same 
  over 
  to 
  May 
  15, 
  

   we 
  get, 
  on 
  subtracting 
  2*4 
  from 
  7*1, 
  an 
  amount 
  4*7 
  for 
  

   2J 
  hours 
  of 
  the 
  solution, 
  a 
  result 
  which 
  very 
  nearly 
  agrees 
  

   with 
  the 
  former 
  results. 
  It 
  will 
  be 
  noted 
  that 
  on 
  May 
  14th 
  

   the 
  air 
  and 
  solution 
  gave 
  with 
  calcium 
  chloride 
  an 
  amount 
  

   4*7, 
  which 
  is 
  much 
  below 
  7*1, 
  showing 
  that 
  if 
  the 
  supply 
  was 
  

   the 
  same, 
  either 
  the 
  chloride 
  absorbed 
  some 
  emanation 
  or 
  

   the 
  acid 
  gave 
  off 
  some. 
  To 
  test 
  this 
  point 
  the 
  experiments 
  

   of 
  May 
  16 
  were 
  done 
  using 
  fresh 
  acid. 
  On 
  this 
  date, 
  owing 
  

   to 
  a 
  plentiful 
  supply 
  of 
  liquid 
  air, 
  I 
  was 
  able 
  to 
  do 
  two 
  

   experiments 
  on 
  the 
  same 
  day 
  so 
  that 
  the 
  amount 
  of 
  emanation 
  

   in 
  the 
  air 
  had 
  scarcely 
  time 
  to 
  change. 
  The 
  results 
  were 
  

  

  75 
  litres 
  of 
  air 
  give 
  *7 
  *. 
  

  

  2 
  J 
  hours 
  of 
  the 
  solution 
  give 
  4*5. 
  

  

  These 
  results 
  are 
  in 
  agreement 
  with 
  those 
  of 
  the 
  first 
  two 
  

   sets 
  and 
  show 
  that 
  the 
  amount 
  of 
  radium 
  required 
  to 
  supply 
  

   the 
  emanation 
  per 
  cub. 
  m. 
  of 
  air 
  

  

  1000 
  -7 
  3'14xl0-« 
  

  

  75 
  

  

  X 
  T^ 
  X 
  

  

  4*5 
  

  

  51 
  

  

  or 
  130xl0" 
  12 
  grm. 
  

  

  * 
  From 
  this 
  result 
  it 
  is 
  evident 
  that 
  the 
  acid 
  is 
  not 
  responsible 
  for 
  any 
  

   emanation. 
  

  

  