﻿Mixte?' 
  — 
  Products 
  of 
  the 
  Explosion 
  of 
  Acetylene. 
  3 
  

  

  spark 
  did 
  not 
  pass 
  in 
  the 
  gas. 
  It 
  is 
  probable, 
  however, 
  that 
  

   sparking 
  caused 
  a 
  change 
  consisting 
  chiefly 
  of 
  polymerization. 
  

   The 
  appearance 
  of 
  the 
  tubes 
  after 
  explosion 
  suggested 
  that 
  

   falling 
  and 
  glowing 
  carbon 
  effected 
  part 
  of 
  the 
  change. 
  In 
  

   order 
  to 
  get 
  evidence 
  of 
  this 
  and 
  also 
  to 
  observe 
  the 
  glow, 
  

   experiments 
  were 
  made 
  in 
  a 
  tube 
  with 
  stop-cocks 
  at 
  its 
  ends 
  

   having 
  a 
  diameter 
  of 
  15 
  mm 
  and 
  a 
  capacity 
  of 
  80 
  cc 
  . 
  I 
  am 
  

   indebted 
  to 
  Dr. 
  Boltwood 
  for 
  his 
  kindness 
  and 
  skill 
  in 
  

   making 
  this 
  tube. 
  It 
  was 
  tilled 
  with 
  dry 
  acetylene 
  at 
  a 
  pres- 
  

   sure 
  of 
  about 
  2*3 
  atmospheres, 
  and 
  was 
  placed 
  upright 
  with 
  the 
  

   electrodes 
  at 
  the 
  lower 
  end. 
  Experiments 
  16, 
  17 
  and 
  18 
  gave 
  

   9, 
  14 
  and 
  10 
  per 
  cent 
  respectively 
  of 
  acetylene 
  in 
  the 
  gas 
  

   remaining 
  after 
  the 
  explosion. 
  In 
  each 
  case 
  a 
  glow 
  tilling 
  3 
  

   or 
  4 
  cm 
  in 
  length 
  of 
  the 
  tube 
  passed 
  slowly 
  to 
  the 
  top. 
  

  

  Since 
  acetylene 
  was 
  found 
  in 
  the 
  gas 
  after 
  explosion 
  in 
  all 
  

   of 
  the 
  foregoing 
  experiments, 
  it 
  seemed 
  best 
  to 
  make 
  more 
  

   tests 
  of 
  the 
  gas 
  when 
  under 
  pressure. 
  For 
  this 
  purpose 
  the 
  

   next 
  series 
  of 
  experiments 
  were 
  made 
  in 
  the 
  U-tubes 
  shown 
  

   in 
  tigs. 
  2, 
  3, 
  4 
  and 
  5. 
  

  

  No. 
  2 
  had 
  an 
  internal 
  diameter 
  of 
  10 
  mm 
  and 
  was 
  filled 
  with 
  

   about 
  15 
  cc 
  of 
  dry 
  acetylene; 
  3 
  a 
  diameter 
  of 
  ll 
  mm 
  and 
  30 
  cc 
  of 
  

   gas; 
  4 
  was 
  a 
  graduated 
  eudiometer 
  17 
  mtn 
  in 
  diameter 
  and 
  was 
  

   filled 
  with 
  60 
  to 
  80 
  cc 
  of 
  gas. 
  No. 
  5 
  was 
  also 
  graduated 
  and 
  was 
  

  

  