﻿Dissociation 
  Pressures 
  of 
  Sulphides. 
  

  

  181 
  

  

  3400 
  

  

  3300 
  

  

  O 
  

   > 
  

  

  o 
  

   .2 
  3200 
  

  

  "5 
  3100 
  

  

  CD 
  

  

  a 
  

  

  5900 
  

  

  5800 
  

  

  5760 
  

  

  may 
  be 
  readily 
  set 
  in 
  position 
  when 
  the 
  tube 
  is 
  put 
  into 
  the 
  

   furnace 
  (tig. 
  2). 
  Thus 
  the 
  constant 
  temperature 
  portions 
  of 
  

   the 
  two 
  furnaces 
  may 
  be 
  kept 
  several 
  hundred 
  degrees 
  apart. 
  

   In 
  these 
  furnaces 
  it 
  is 
  possible 
  to 
  maintain 
  temperature 
  

   regions 
  of 
  from 
  4 
  CIQ 
  to 
  12 
  cm 
  in 
  length, 
  over 
  which 
  the 
  variation 
  

   is 
  not 
  more 
  than 
  - 
  5°. 
  This 
  requires 
  frequent 
  temperature 
  

   readings 
  throughout 
  the 
  entire 
  length 
  of 
  the 
  apparatus 
  at 
  inter- 
  

  

  Fig. 
  4. 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  i 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  > 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  I 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  30 
  32 
  34 
  36 
  38 
  40 
  42 
  44 
  46 
  48 
  SO 
  SZ 
  5+ 
  56 
  58 
  60 
  62 
  64 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  n 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  n 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  44 
  40 
  36 
  32 
  28 
  24 
  20 
  

  

  Centimeters 
  from 
  outside 
  end 
  of 
  furnace. 
  

  

  16 
  

  

  12 
  

  

  Fig. 
  4. 
  Curves 
  showing 
  temperature 
  distribution 
  in 
  the 
  furnaces. 
  

  

  I, 
  I. 
  Curve 
  for 
  sulphur 
  furnace. 
  

   II, 
  II. 
  " 
  " 
  sulphide 
  furnace. 
  

  

  414° 
  

  

  406° 
  

  

  398 
  c 
  

  

  Q 
  

  

  390° 
  -5 
  

  

  Co 
  

   CO 
  

  

  a 
  

  

  CD 
  

  

  382° 
  H 
  

  

  670° 
  

  

  662° 
  

  

  654° 
  

  

  vals 
  of 
  about 
  3 
  cm 
  and 
  frequent 
  adjustment 
  of 
  the 
  currents 
  as 
  

   the 
  temperature 
  readings 
  may 
  indicate 
  — 
  a 
  process 
  frequently 
  

   consuming 
  four 
  or 
  five 
  days. 
  A 
  curve 
  plotted 
  from 
  data 
  of 
  

   this 
  kind 
  is 
  given 
  in 
  fig. 
  4. 
  Such 
  curves 
  were 
  worked 
  out 
  

   at 
  temperature 
  intervals 
  of 
  about 
  25°. 
  It 
  is 
  obviously 
  essen- 
  

   tial 
  that 
  no 
  point 
  on 
  these 
  curves 
  between 
  the 
  positions 
  of 
  

  

  