﻿126 
  

  

  Mr. 
  S. 
  Kinoshita 
  on 
  Condensation 
  of 
  

  

  the 
  same 
  conditions. 
  The 
  pressure 
  in 
  the 
  spiral 
  at 
  which 
  the 
  

   emanation 
  condensed 
  was 
  calculated 
  from 
  that 
  in 
  the 
  spiral 
  

   itself, 
  and 
  from 
  the 
  ratio 
  of 
  the 
  volume 
  of 
  the 
  spiral 
  to 
  that 
  

   of 
  A 
  (the 
  portion 
  between 
  Ci 
  and 
  C 
  2 
  ), 
  allowance 
  being 
  made 
  

   for 
  the 
  difference 
  in 
  temperature 
  between 
  the 
  two 
  systems. 
  

   The 
  difference 
  in 
  the 
  final 
  values 
  of 
  the 
  ordinates 
  of 
  these 
  

   curves 
  is 
  due 
  to 
  the 
  fact 
  that, 
  when 
  a 
  glass 
  tube 
  is 
  inserted, 
  

   more 
  emanation 
  goes 
  into 
  the 
  electroscope. 
  Theoretically 
  

   the 
  curves 
  should 
  attain 
  maximum 
  values 
  at 
  certain 
  tempe- 
  

   ratures 
  and 
  then 
  decrease, 
  because 
  the 
  higher 
  the 
  temperature 
  

   of 
  the 
  spiral, 
  the 
  less 
  emanation 
  passes 
  into 
  it. 
  But, 
  on 
  the 
  

   other 
  hand, 
  when 
  the 
  spiral 
  is 
  cooler, 
  it 
  retains 
  more 
  ema- 
  

   nation 
  when 
  the 
  stopcock 
  C 
  3 
  is 
  opened. 
  The 
  magnitude 
  of 
  

   this 
  last 
  correction 
  was 
  determined, 
  but 
  found 
  to 
  be 
  smaller 
  

   than 
  the 
  experimental 
  error. 
  

  

  Fig, 
  8. 
  (Actinium 
  Emanation.) 
  

  

  too 
  

  

  o 
  

  

  © 
  70 
  

  

  P« 
  

  

  •4 
  

  

  60 
  

  

  50 
  

  

  30 
  

  

  20 
  

  

  

  ■115 
  -110 
  -105 
  -100 
  -95 
  

  

  <i 
  -160 
  -155 
  -150 
  -145 
  -140 
  -135 
  -130 
  -125 
  - 
  

   o* 
  TenipeiatUlv. 
  

  

  The 
  experiment 
  at 
  atmospheric 
  pressure 
  was 
  very 
  difficult, 
  

   and 
  the 
  result 
  can 
  only 
  be 
  considered 
  approximate, 
  because 
  

   when 
  the 
  spiral 
  was 
  at 
  atmospheric 
  pressure 
  and 
  the 
  stopcock 
  

   ( 
  <:; 
  was 
  opened, 
  the 
  gold-leaf 
  fell 
  a 
  few 
  divisions, 
  even 
  if 
  no 
  

   emanation 
  were 
  present. 
  The 
  cause 
  of 
  this 
  is 
  not 
  very 
  

   evident, 
  bnt 
  is 
  possibly 
  due 
  to 
  electrification 
  of 
  the 
  gas, 
  

   rushing 
  rapidly 
  through 
  the 
  rubber 
  tube. 
  If 
  the 
  electroscope 
  

   were 
  evacuated 
  at 
  a 
  pressure 
  much 
  higher 
  than 
  10 
  mm., 
  viz. 
  

   200 
  or 
  400 
  mm., 
  in 
  order 
  to 
  admit 
  a 
  smaller 
  quantity 
  of 
  gas 
  

   into 
  the 
  electroscope, 
  the 
  discharging 
  power 
  due 
  to 
  the 
  active 
  

   deposit 
  increased 
  very 
  greatly, 
  and 
  exact 
  measurements 
  could 
  

   not 
  be 
  taken. 
  

  

  