﻿522 
  

  

  Mr. 
  F. 
  Soddy 
  on 
  the 
  Production 
  of 
  

  

  which 
  is 
  then 
  filled 
  with 
  liquid 
  air. 
  Its 
  volume 
  is 
  equal 
  to 
  

   or 
  greater 
  than 
  that 
  of 
  the 
  U-tube, 
  and 
  hence 
  the 
  greater 
  part 
  

   of 
  the 
  gas 
  is 
  obtained 
  for 
  the 
  test. 
  

  

  The 
  procedure 
  in 
  removing 
  air 
  is 
  simply 
  to 
  keep 
  the 
  solu- 
  

   tion 
  boiling 
  and 
  to 
  pass 
  a 
  rapid 
  current 
  of 
  gas 
  from 
  the 
  

   voltameter, 
  recombining 
  it 
  with 
  occasional 
  sparks 
  in 
  the 
  

   chamber 
  E. 
  From 
  time 
  to 
  time, 
  the 
  mercury 
  in 
  the 
  tap 
  is 
  

  

  