﻿B.elatio7i 
  between 
  Uranium 
  and 
  Radium. 
  

   Table 
  II. 
  

  

  851 
  

  

  I 
  

  

  1 
  

   (Time)^ 
  

  

  Observed 
  

   Leak. 
  : 
  

  

  Reduction 
  

   Factor, 
  

  

  Reduced 
  Radium 
  j 
  

   Leak. 
  ( 
  x 
  lO-i^ 
  gram). 
  

  

  Experiment 
  I. 
  255 
  grains 
  Uranium 
  purified, 
  24/10/05. 
  

  

  9/6/08 
  2-62 
  

  

  Q-QC, 
  . 
  2-89 
  

  

  X 
  -96x1-15 
  

  

  3-2 
  1 
  18-5* 
  

  

  7/8/08 
  ! 
  2-78 
  

   25/9/08 
  i 
  2-95 
  

  

  7-70 
  ! 
  3-3 
  

   8-57 
  ; 
  353 
  

  

  X-96 
  

   X-96 
  

  

  3-17 
  18-4* 
  

   3-39 
  19-6 
  

  

  20/11/08 
  

  

  5/5/09 
  

  

  14/6/09 
  

  

  27/8/09 
  

  

  29/9/09 
  

  

  308 
  

   3-53 
  

   3-64 
  

   3-85 
  

  

  a-93 
  

  

  9-49 
  : 
  3-44 
  

   12-46 
  1 
  3-90 
  

   13-24 
  1 
  4-20 
  

  

  14-80 
  i 
  4-28 
  

   15-43 
  i 
  416 
  

  

  i 
  

  

  

  3-44 
  1 
  19-8 
  

   3-90 
  j 
  22-5 
  

   4-20 
  1 
  24-3 
  

   4-28 
  i 
  24-7 
  

   4-16 
  24-1 
  

  

  Experiment 
  IV. 
  278 
  grams 
  

  

  Uranium 
  purified, 
  14/8/06. 
  

  

  30/5/08 
  

  

  1-80^ 
  

  

  3-24 
  

  

  «. 
  

  

  X 
  -96x1-15 
  

  

  302 
  

  

  17-5 
  

  

  7/5/09 
  

   25/6/09 
  

   4/10/09 
  

  

  2-73 
  

  

  2-87 
  

   315 
  

  

  7-45 
  

  

  8-22 
  

   9-90 
  

  

  3-68 
  

   3-72 
  

  

  4-00 
  

  

  ... 
  

  

  3-68 
  

   3-72 
  

   400 
  

  

  213 
  

   21-5 
  

   23-1 
  

  

  Experiment 
  II. 
  408 
  grams 
  

  

  Uranium 
  purified, 
  13/12/06. 
  

  

  8/8/08 
  

   19/11/08 
  

  

  1-66 
  

   1-93 
  

  

  i 
  2-75 
  

   1 
  3-73 
  

  

  0-70 
  

  

  0-80 
  

  

  X-96 
  

   X-9G 
  

  

  0-67 
  

   0-77 
  

  

  3-87^ 
  

   4-45 
  

  

  6/5/09 
  

   15/6/(J9 
  

   1/10/09 
  

  

  2-40 
  

   2-50 
  

   2-80 
  

  

  5-76 
  

   6-25 
  

  

  ' 
  7-83 
  

  

  1-25 
  

   1-26 
  

   1-37 
  

  

  ... 
  

   ... 
  

  

  1-25 
  

   1-26 
  

   1-37 
  

  

  7-20 
  

   7-30 
  

  

  7-90 
  

  

  of 
  radium 
  has 
  increased 
  with 
  time. 
  The 
  measurements 
  are 
  

   plotted 
  against 
  the 
  square 
  o£ 
  the 
  time 
  in 
  fig. 
  3 
  (p. 
  852). 
  It 
  

   will 
  be 
  seen 
  that 
  all 
  the 
  points 
  ]ie 
  close 
  to 
  straight 
  lines. 
  The 
  

   maximum 
  departure 
  is 
  in 
  the 
  case 
  of 
  the 
  last 
  test 
  performed 
  

   in 
  Experiment 
  I., 
  which 
  lies 
  about 
  2 
  units 
  too 
  low. 
  The 
  

   ordinary 
  error 
  is 
  not 
  more 
  than 
  1 
  unit, 
  or 
  10 
  "^^ 
  gram. 
  Con- 
  

   sidering 
  the 
  nature 
  of 
  the 
  measurement 
  the 
  agreement 
  is 
  

   perhaps 
  closer 
  than 
  might 
  have 
  been 
  expected, 
  as 
  it 
  is 
  

   doubtful 
  if 
  any 
  previous 
  measurements 
  of 
  these 
  small 
  

   quantities 
  of 
  radium 
  have 
  been 
  made 
  to 
  anything 
  approaching 
  

   this 
  degree 
  of 
  accuracy. 
  

  

  