﻿Dissociation 
  Pressures 
  of 
  Sulphides. 
  

  

  183 
  

  

  phur 
  under 
  measured 
  pressures. 
  His 
  determinations 
  extend 
  

   from 
  374° 
  to 
  444*8°. 
  Some 
  years 
  later 
  Matthies* 
  supple- 
  

   mented 
  these 
  by 
  measurements 
  extending 
  from 
  2102° 
  to 
  3794°, 
  

   using 
  the 
  same 
  method 
  as 
  Bodenstein. 
  Earlier 
  determinations 
  

   by 
  Regnaultf 
  extended 
  to 
  higher 
  temperatures 
  (450° 
  to 
  570°), 
  

   but 
  as 
  they 
  are 
  beyond 
  the 
  range 
  of 
  our 
  experiments 
  they 
  are 
  

   not 
  quoted. 
  

  

  For 
  the 
  convenience 
  of 
  the 
  reader 
  the 
  data 
  of 
  Ruff 
  and 
  Graf, 
  

   Matthies, 
  and 
  Bodenstein 
  are 
  tabulated 
  below. 
  

  

  Table 
  I. 
  

   The 
  vapor 
  pressures 
  of 
  sulphur 
  as 
  determined 
  by 
  other 
  observers. 
  

  

  

  

  Obser 
  

  

  ver 
  

  

  

  

  Buff 
  and 
  On 
  

  

  if 
  

  

  W. 
  Matthies 
  

  

  M 
  

  

  ax 
  Bodenstein 
  

  

  

  p 
  in 
  mm. 
  of 
  

  

  

  p 
  in 
  mm. 
  

  

  

  p 
  in 
  mm. 
  of 
  

  

  fin 
  C° 
  

  

  mercury 
  

  

  tinC° 
  

  

  of 
  mercury 
  

  

  tin 
  C° 
  

  

  mercury 
  

  

  49 
  

  

  7 
  

  

  0-00034 
  

  

  210-2 
  

  

  1-35J 
  

  

  374- 
  

  

  240- 
  

  

  78 
  

  

  3 
  

  

  •0023 
  

  

  216-7 
  

  

  2-10J 
  

  

  393- 
  

  

  336- 
  

  

  89' 
  

  

  

  

  •0057 
  

  

  222-4 
  

  

  3-20| 
  

  

  410' 
  

  

  443- 
  

  

  99 
  

  

  3 
  

  

  •0089 
  

  

  230-6 
  

  

  4-48 
  

  

  427-0 
  

  

  580- 
  

  

  104 
  

  

  

  

  •0115 
  

  

  234-4 
  

  

  5-54 
  

  

  444-8 
  

  

  764-5 
  

  

  110 
  

  

  8 
  

  

  •0200 
  

  

  237-3 
  

  

  6-5 
  

  

  

  

  114 
  

  

  5 
  

  

  •0285 
  

  

  241-8 
  

  

  8-45 
  

  

  

  

  123 
  

  

  8 
  

  

  •0535 
  

  

  265-0 
  

  

  20-5 
  

  

  

  

  131 
  

  

  9 
  

  

  •081 
  

  

  306*5 
  

  

  53-5 
  

  

  

  

  132 
  

  

  2 
  

  

  •079 
  

  

  341-7 
  

  

  105-5 
  

  

  

  

  133 
  

  

  1 
  

  

  •088 
  

  

  352-5 
  

  

  133-0 
  

  

  

  

  141 
  

  

  

  

  •131 
  

  

  363-0 
  

  

  176*0 
  

  

  

  

  147 
  

  

  

  

  •192 
  

  

  379-4 
  

  

  250-1 
  

  

  

  

  157 
  

  

  

  

  •332 
  

  

  

  

  

  

  162 
  

  

  

  

  •403 
  

  

  

  

  

  

  172 
  

  

  

  

  •629 
  

  

  

  

  

  

  189 
  

  

  5 
  

  

  1-38 
  

  

  

  

  

  

  211-3 
  

  

  3-14 
  

  

  

  

  

  

  Just 
  

  

  II 
  T. 
  The 
  Dissociation 
  Pressure 
  of 
  Sulphides. 
  

   how 
  widely 
  applicable 
  the 
  above 
  method 
  is 
  to 
  the 
  

  

  determination 
  of 
  dissociation 
  pressures 
  can 
  not 
  yet 
  be 
  predicted, 
  

   as 
  too 
  little 
  is 
  known 
  about 
  the 
  stability 
  of 
  the 
  various 
  sul- 
  

   phides, 
  but 
  we 
  can 
  see 
  no 
  impediment 
  to 
  its 
  use 
  at 
  any 
  tem- 
  

   peratures 
  where 
  quartz 
  glass 
  will 
  hold 
  gas 
  tight 
  (1100° 
  to 
  1200°). 
  

  

  *Physik. 
  Zeit., 
  vii, 
  395, 
  1906. 
  

  

  f 
  Mem. 
  de 
  l'Academie, 
  xxvi, 
  339, 
  1862. 
  

  

  % 
  Matthies 
  states 
  that 
  his 
  results 
  below 
  4 
  mm. 
  pressure 
  are 
  unreliable. 
  

  

  