﻿466 
  

  

  Mr. 
  L. 
  Vegard 
  on 
  the 
  Electric 
  Discharge 
  

  

  of 
  air 
  through 
  the 
  tube 
  system 
  from 
  e 
  to 
  D 
  (fig. 
  1). 
  The 
  

   gas 
  was 
  introduced 
  into 
  the 
  discharge-tube 
  (A) 
  by 
  means 
  of 
  

   two 
  taps 
  {h) 
  and 
  (c) 
  separated 
  by 
  a 
  capillary 
  tube. 
  The 
  U-tube 
  

   C 
  containing 
  concentrated 
  sulphuric 
  acid 
  (sp. 
  g. 
  1*84:) 
  served 
  

   for 
  measuring 
  the 
  pressure. 
  The 
  level 
  difference 
  was 
  read 
  

   with 
  a 
  cathetometer 
  ; 
  in 
  that 
  way 
  the 
  pressure 
  could 
  be 
  

   found 
  with 
  an 
  accuracy 
  of 
  jJ-q 
  mm. 
  Hg. 
  

  

  § 
  3. 
  The 
  gases 
  were 
  produced 
  in 
  somewhat 
  different 
  ways 
  : 
  

   in 
  all 
  cases, 
  however, 
  a 
  method 
  was 
  employed 
  allowing 
  the 
  

   gases 
  to 
  be 
  formed 
  in 
  an 
  exhausted 
  vessel. 
  

  

  The 
  HCl 
  gas 
  was 
  produced 
  from 
  NH4CI 
  and 
  concentrated 
  

   H2SO4 
  in 
  the 
  apparatus 
  shown 
  in 
  fig. 
  1 
  (E). 
  The 
  somewhat 
  

  

  Fi-. 
  1. 
  

  

  wide 
  tube 
  contains 
  the 
  ammonium 
  salt, 
  the 
  small 
  bulb 
  the 
  acid. 
  

   Before 
  exhausting, 
  the 
  acid 
  was 
  made 
  to 
  fill 
  the 
  boring 
  of 
  the 
  

   tap. 
  The 
  HBr 
  and 
  HI 
  gases 
  were 
  produced 
  from 
  their 
  

  

  Fio-. 
  2. 
  

  

  ■ 
  'g^ia^gi: 
  ;.■:•■:??- 
  ^ 
  if- 
  ■•■: 
  ^ 
  ■:: 
  ??£ 
  

  

  m9 
  

  

  concentrated 
  aqueous 
  solutions 
  in 
  an 
  apparatus 
  shown 
  in 
  

   fig. 
  2. 
  The 
  air 
  from 
  the 
  boring 
  of 
  the 
  tap 
  g 
  was 
  removed 
  

  

  