﻿598 
  

  

  Mr. 
  J. 
  Satterly 
  on 
  the 
  Amount 
  of 
  

   Table 
  III. 
  

  

  Date 
  of 
  testing. 
  

  

  Charcoal 
  

   Tube. 
  

  

  Period 
  

   of 
  Rest 
  

   in 
  days. 
  

  

  Amount 
  

   accumulated 
  : 
  

   expressed 
  in 
  

   divs. 
  per 
  min. 
  

  

  Amount 
  

   accumulated 
  

  

  per 
  day 
  : 
  

   expressed 
  in 
  

   divs. 
  per 
  min. 
  

  

  Wed. 
  Jan. 
  5 
  

  

  Mon. 
  ,, 
  20 
  

  

  Thurs. 
  Feb. 
  13 
  

  

  Tues. 
  „ 
  18 
  

  

  Wed. 
  „ 
  19 
  

  

  Wed. 
  „ 
  25 
  

  

  Thurs. 
  Mar. 
  4 
  

  

  )» 
  )) 
  >> 
  

  

  Tues. 
  „ 
  10 
  

  

  Apr. 
  7 
  

  

  Wed. 
  May 
  6 
  

  

  A 
  

  

  B 
  

  

  A 
  

   B 
  

  

  C 
  

  

  A 
  

   B 
  

  

  A 
  

   B 
  

  

  A 
  

   B 
  

  

  A 
  

   B 
  

  

  A+B 
  

  

  A-J-B 
  

  

  26 
  

  

  31 
  

  

  6 
  

   6 
  

  

  25 
  

  

  5 
  

  

  5 
  

  

  7 
  

   7 
  

  

  6 
  

   6 
  

  

  4 
  

   4 
  

  

  4 
  

  

  27 
  

  

  1-1 
  

  

  2-0 
  

  

  •8 
  

   •75 
  

  

  2-6 
  

  

  •6 
  

  

  •65 
  

  

  •55 
  

   •90 
  

  

  •67 
  

   •5 
  

  

  •56 
  

  

  •8 
  

  

  10 
  

   3-2 
  

  

  •20 
  

  

  •36 
  

  

  •20 
  

   •20 
  

  

  •47 
  

  

  •18 
  

   •19 
  

  

  •13 
  

   •24 
  

  

  •19 
  

   •13 
  

  

  •19 
  

   •26 
  

  

  •33 
  

  

  •57 
  

  

  Outside 
  

  

  air 
  

  

  First 
  Set 
  of 
  Experiments 
  with 
  the 
  Charcoal 
  Tubes. 
  

   During 
  this 
  set 
  two 
  tubes 
  were 
  connected 
  in 
  parallel 
  as 
  

  

  shown 
  in 
  the 
  diagram 
  below: 
  — 
  

  

  -CaCl 
  2 
  —- 
  

   Radium 
  

   "solution 
  1 
  

  

  ■Charcoal 
  tube 
  A»— 
  ^-Gauge 
  A 
  

  

  Charcoal 
  

   tube 
  B 
  B 
  

  

  -CaCL 
  

  

  Gauge 
  B 
  

   orC 
  

  

  Pump. 
  

  

  So 
  that 
  the 
  air 
  absorbed 
  in 
  tube 
  B 
  should 
  contain 
  volume 
  for 
  

   volume 
  the 
  same 
  amount 
  of 
  emanation 
  as 
  the 
  air 
  absorbed 
  in 
  

   tube 
  A. 
  Once 
  or 
  twice 
  tubes 
  A 
  and 
  B 
  were 
  interchanged 
  

   in 
  order 
  to 
  detect 
  any 
  differences 
  in 
  the 
  absorbing 
  powers 
  of 
  

   the 
  charcoal, 
  but 
  none 
  was 
  found. 
  Sometimes 
  the 
  run 
  was 
  

   made 
  one 
  day 
  and 
  the 
  tubes 
  heated 
  the 
  next; 
  corrections 
  in 
  

   all 
  cases 
  were 
  made 
  for 
  accumulation 
  and 
  decay. 
  The 
  results 
  

   are 
  indicated 
  in 
  Table 
  IV. 
  In 
  the 
  last 
  column 
  I 
  have 
  tabulated 
  

   the 
  relative 
  amount 
  of 
  emanation 
  absorbed 
  from 
  the 
  solution 
  

   per 
  two 
  hours' 
  run. 
  The 
  amount 
  is 
  not 
  quite 
  constant, 
  but 
  

   very 
  nearly 
  so, 
  if 
  the 
  run 
  of 
  Jan. 
  27 
  is 
  omitted. 
  The 
  approxi- 
  

   mate 
  constancy 
  is 
  a 
  test 
  of 
  the 
  accuracy 
  of 
  the 
  method. 
  

  

  