﻿Manometer 
  for 
  High-Pressure 
  Explosions. 
  469 
  

  

  It 
  is 
  advisable 
  to 
  reserve 
  the 
  term 
  " 
  explosion 
  " 
  for 
  the 
  second 
  

   of 
  the 
  above 
  classes, 
  denoting- 
  by 
  the 
  word 
  *' 
  detonation 
  " 
  a 
  

   reaction 
  which 
  occupies 
  less 
  than 
  one 
  ten-thousandth 
  of 
  a 
  

   second, 
  and 
  by 
  the 
  word 
  " 
  combustion 
  " 
  one 
  which 
  requires 
  more 
  

   than 
  one 
  tenth 
  of 
  a 
  second. 
  

  

  Table 
  I. 
  — 
  Rise 
  of 
  Pressure. 
  

   See 
  Plate 
  IX. 
  (Film 
  41, 
  explosion 
  181.) 
  

  

  Spherical 
  inclosure 
  4 
  in. 
  diameter. 
  Capacity 
  551*91 
  c.c. 
  

   = 
  0-0195 
  cub. 
  ft. 
  

  

  Temperature 
  of 
  inclosure 
  before 
  firing- 
  18° 
  C. 
  

  

  ., 
  after 
  products 
  of 
  combustion 
  had 
  cooled 
  

  

  24° 
  C. 
  

  

  T 
  >jL 
  . 
  , 
  f 
  77*28 
  atmospheres 
  

  

  Initial 
  pressure 
  | 
  =1136 
  lbs. 
  per 
  sq. 
  inch. 
  

  

  Ratio 
  : 
  Air 
  to 
  Coal-gas 
  . 
  . 
  6*0 
  

  

  t. 
  r 
  . 
  , 
  . 
  f 
  646*" 
  atmospheres. 
  

  

  Maximum 
  explosive 
  pressure 
  j 
  =Q&)Q 
  lbg 
  ^ 
  ^ 
  .^ 
  

  

  Ratio 
  : 
  maximum 
  explosive 
  \ 
  o. 
  4 
  

   pressure 
  to 
  initial 
  pressure 
  J 
  

  

  Residual 
  pressure 
  / 
  63:8 
  atmospheres 
  

  

  1 
  \ 
  =93/ 
  lbs. 
  per 
  sq. 
  inch. 
  

  

  Analysis 
  of 
  Besidue. 
  

  

  Carbon 
  dioxide 
  9-8 
  per 
  cent. 
  

  

  Oxygen 
  3-0 
  

  

  Nitrogen 
  87-2 
  „ 
  

  

  looo 
  

  

  

  

  Absolute 
  

  

  

  

  Absolute 
  

  

  Time 
  in 
  

  

  Beading 
  in 
  

  

  Pressure 
  

  

  Time 
  in 
  

  

  Beading 
  in 
  

  

  Pressure 
  

  

  seconds. 
  

  

  millimetres. 
  

  

  in 
  lbs. 
  

   per 
  sq. 
  in. 
  

  

  seconds. 
  

  

  millimetres. 
  

  

  in 
  lbs. 
  

   per 
  sq. 
  in. 
  

  

  0000 
  

  

  

  1136 
  

  

  0-058 
  

  

  21-99 
  

  

  9508 
  

  

  0010 
  

  

  0-77 
  

  

  1237 
  

  

  0060 
  

  

  21-91 
  

  

  9477 
  

  

  0-020 
  

  

  1-57 
  

  

  1549 
  

  

  0062 
  

  

  21-91 
  

  

  9477 
  

  

  0-030 
  

  

  3-06 
  

  

  2130 
  

  

  0-064 
  

  

  21-67 
  

  

  9385 
  

  

  0-040 
  

  

  5 
  03 
  

  

  2898 
  

  

  066 
  

  

  21-63 
  

  

  9369 
  

  

  0-042 
  

  

  521 
  

  

  2968 
  

  

  0068 
  

  

  21-60 
  

  

  9357 
  

  

  0-044 
  

  

  5-84 
  

  

  3204 
  

  

  0-070 
  

  

  21-56 
  

  

  9340 
  

  

  0046 
  

  

  6-38 
  

  

  3424 
  

  

  0-080 
  

  

  21-22 
  

  

  9209 
  

  

  0-048 
  

  

  6-86 
  

  

  3612 
  

  

  0090 
  

  

  21-07 
  

  

  9149 
  

  

  0-050 
  

  

  7-47 
  

  

  3850 
  

  

  o-ioo 
  

  

  20-87 
  

  

  9071 
  

  

  0-052 
  

  

  1080 
  

  

  5147 
  

  

  0-150 
  

  

  19-73 
  

  

  8628 
  

  

  0054 
  

  

  15-92 
  

  

  7143 
  

  

  0-200 
  

  

  18-61 
  

  

  8192 
  

  

  0056 
  

  

  19-83 
  

  

  8667 
  

  

  1 
  

  

  

  

  

  