﻿throwjh 
  the 
  Gases 
  HCl, 
  HBr, 
  and 
  HI. 
  i79 
  

  

  Absorption 
  in 
  HBr. 
  

   § 
  15. 
  The 
  characteristic 
  abrnpt 
  occurrence 
  of 
  the 
  absorp- 
  

   tion 
  found 
  for 
  oxygen 
  is 
  also 
  observed 
  for 
  KBr. 
  With 
  

   a 
  pressure 
  of 
  0-55 
  mm., 
  currents 
  up 
  to 
  95 
  . 
  10"^ 
  gave 
  very 
  

   little 
  absorption, 
  the 
  value 
  of 
  q 
  for 
  the 
  largest 
  current 
  beinor 
  

   only 
  0'05. 
  For 
  higher 
  pressure 
  the 
  absorption 
  was 
  still 
  

   less. 
  For 
  a 
  pressure 
  of 
  0*27 
  and 
  currents 
  up 
  to 
  20 
  . 
  10"^ 
  the 
  

   absorption 
  was 
  almost 
  inappreciable. 
  A 
  current 
  of 
  24 
  . 
  10~^ 
  

   gave 
  (^ 
  = 
  0-015; 
  raising 
  it 
  to 
  34 
  . 
  10~% 
  however, 
  a 
  sudden 
  

   absorption 
  took 
  place. 
  ' 
  The 
  properties 
  of 
  discharge 
  varied 
  

   as 
  shown 
  in 
  Table 
  IX. 
  

  

  

  Table 
  IX. 
  

  

  

  Time. 
  

  

  10^1. 
  

  

  P- 
  

  

  CatliocTe 
  

   fall. 
  

  

  

  

  34 
  

  

  0-243 
  

  

  ()50 
  

  

  40 
  

  

  6-7 
  

  

  0-156 
  

  

  — 
  

  

  oo 
  

  

  0-55 
  

  

  0-14S 
  

  

  880 
  

  

  The 
  mean 
  value 
  of 
  I 
  in 
  the 
  time 
  interval 
  is 
  4*7 
  .10"^ 
  am., 
  

   which 
  gives 
  for 
  q 
  the 
  average 
  value 
  0*48, 
  or 
  about 
  double 
  

   the 
  value 
  found 
  for 
  oxygen. 
  

  

  Absolution 
  in 
  HCl. 
  

  

  § 
  16. 
  The 
  absorption 
  effect 
  observed 
  for 
  O2 
  and 
  HBr 
  has 
  

   also 
  been 
  found 
  for 
  HCl 
  ; 
  but 
  in 
  those 
  cases 
  examined 
  the 
  

   effect 
  has 
  not 
  been 
  so 
  abrupt. 
  With 
  a 
  pressure 
  so 
  low 
  as 
  

   0*46 
  the 
  discharoe 
  ^vas 
  maintained 
  with 
  currents 
  of 
  16 
  . 
  10~^ 
  

   and 
  2'2 
  . 
  10~^ 
  am. 
  each 
  for 
  about 
  a 
  quarter 
  of 
  an 
  hour 
  without 
  

   noticeable 
  absorption 
  ; 
  but 
  with 
  a 
  current 
  of 
  98 
  . 
  10~^ 
  the 
  

   absorption 
  became 
  very 
  marked, 
  the 
  current 
  decreased, 
  and 
  

   within 
  14 
  min. 
  the 
  pressure 
  went 
  down 
  from 
  0*460 
  to 
  

   0*350 
  mm., 
  the 
  absorption 
  per 
  coulomb 
  '7 
  = 
  0-052. 
  With 
  

   pressure 
  0*27 
  a 
  current 
  of 
  29 
  . 
  10~^ 
  gave 
  considerable 
  ab- 
  

   sorption. 
  As 
  regards 
  the 
  interpretation 
  of 
  this 
  somewhat 
  

   smaller 
  absorption 
  effect 
  in 
  HCl 
  we 
  must 
  keep 
  in 
  mind 
  that 
  

   there 
  is 
  always 
  a 
  possibility 
  for 
  a 
  contra-effect 
  in 
  the 
  evolu- 
  

   tion 
  of 
  hydrogen 
  from 
  the 
  cathode. 
  

  

  Concerning 
  the 
  Cause 
  of 
  the 
  Absorption. 
  

  

  § 
  17. 
  A 
  very 
  important 
  property 
  of 
  this 
  kind 
  of 
  absorp- 
  

   tion 
  is 
  that 
  it 
  is 
  always 
  found 
  to 
  stop 
  immediately 
  the 
  

  

  