﻿Manometer 
  for 
  High-Pressure 
  Explosions, 
  

  

  467 
  

  

  without 
  any 
  sign 
  of 
  vibration 
  . 
  The 
  necessary 
  data 
  with 
  regard 
  

   to 
  Pis. 
  IX. 
  and 
  X. 
  will 
  be 
  found 
  in 
  Tables 
  I. 
  and 
  II. 
  

  

  It 
  is 
  intended 
  to 
  obtain 
  similar 
  curves 
  covering 
  a 
  range 
  of 
  

   pressure 
  up 
  to 
  20,000 
  lbs. 
  per 
  square 
  inch, 
  and 
  referring 
  to 
  

   mixtures 
  from 
  the 
  most 
  explosive 
  to 
  the 
  non-explosive. 
  The 
  

   work 
  will 
  be 
  divided 
  into 
  four 
  parts 
  : 
  namely, 
  I. 
  Oxygen 
  and 
  

   hydrogen 
  ; 
  II. 
  Coal-gas 
  and 
  air 
  ; 
  III. 
  Other 
  gaseous 
  explosive 
  

   mixtures 
  ; 
  IV. 
  Solid 
  and 
  liquid 
  explosives. 
  

  

  With 
  regard 
  to 
  coal-gas 
  and 
  air, 
  barely 
  half 
  the 
  work 
  has 
  

   as 
  yet 
  been 
  finished 
  ; 
  it 
  is 
  therefore 
  too 
  soon 
  to 
  draw 
  any 
  

   general 
  conclusions. 
  A 
  few 
  points, 
  however, 
  in 
  the 
  records 
  

   here 
  given 
  deserve 
  attention. 
  

  

  Fig-. 
  3. 
  — 
  Coal-gas 
  and 
  Air. 
  Kate 
  of 
  Cooling. 
  

  

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  1.0.00- 
  

  

  1. 
  The 
  time 
  required 
  to 
  reach 
  the 
  maximum 
  pressure, 
  

   namely 
  0*058 
  second, 
  is 
  not 
  for 
  from 
  that 
  which 
  would 
  be 
  

   required 
  with 
  the 
  same 
  mixture 
  at 
  atmospheric 
  pressure. 
  

  

  2. 
  The 
  ratio 
  of 
  explosive 
  to 
  initial 
  pressure 
  has 
  been 
  

   increased. 
  At 
  or 
  near 
  atmospheric 
  pressure 
  the 
  ratio 
  for 
  

   this 
  mixture 
  would 
  be 
  about 
  7; 
  in 
  the 
  present 
  case 
  it 
  is 
  S'6. 
  

   This 
  fact 
  is 
  due 
  to 
  three 
  causes 
  which 
  work 
  simultaneously, 
  

   namely: 
  — 
  (A) 
  The 
  departure 
  of 
  gases 
  from 
  Boyle's 
  law; 
  

   (B) 
  The 
  relative 
  decrease 
  of 
  thermal 
  loss 
  during 
  the 
  time 
  

   occupied 
  by 
  the 
  combustion 
  ; 
  (C) 
  The 
  increase 
  in 
  the 
  absolute 
  

   temperature 
  at 
  which 
  dissociation 
  would 
  take 
  place. 
  

  

  3. 
  The 
  rate 
  of 
  cooling 
  has 
  greatly 
  decreased. 
  

  

  