﻿470 
  Recording 
  Manometer 
  for 
  High-Pressure 
  Explosions. 
  

   Table 
  II. 
  — 
  Fall 
  of 
  Pressure. 
  

   See 
  PL 
  X. 
  and 
  fig. 
  3. 
  (Film 
  38, 
  explosion 
  175.) 
  

  

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

   = 
  0-0195 
  cub. 
  il. 
  

  

  Temperature 
  of 
  inclosnre 
  "before 
  firing 
  21° 
  C. 
  

  

  „ 
  ., 
  after 
  products 
  of 
  combustion 
  bad 
  cooled 
  

  

  27° 
  C. 
  

  

  T 
  ... 
  , 
  f 
  74-38 
  atmospheres 
  

  

  Initial 
  pressure 
  j 
  =1Q94 
  ^ 
  ^ 
  gq 
  _ 
  inch< 
  

  

  Ratio 
  : 
  Air 
  to 
  Coal-gas 
  . 
  . 
  5*71. 
  

  

  Ar 
  , 
  • 
  -, 
  ■ 
  f 
  654*2 
  atmospheres 
  

  

  Maximum 
  explosive 
  pressure 
  j 
  =961g 
  ^ 
  ^ 
  ^ 
  inch< 
  

  

  Maximum 
  temperature 
  2483° 
  C. 
  

  

  Ratio 
  : 
  maximum 
  explosive 
  \ 
  q.q 
  

   pressure 
  to 
  initial 
  pressure 
  J 
  

  

  Residual 
  pressure 
  ( 
  ^atmospheres 
  

  

  ^ 
  { 
  =86/ 
  lbs. 
  per 
  sq. 
  inch. 
  

  

  Analysis 
  of 
  Residue. 
  

  

  Carbon 
  dioxide 
  ..... 
  11*2 
  per 
  cent. 
  

  

  Oxygen 
  20 
  „ 
  

  

  Nitrogen 
  86*8 
  „ 
  

  

  Tooo 
  

  

  Time 
  

  

  in 
  

  

  seeonds. 
  

  

  Reading 
  j 
  

  

  in 
  

   millims. 
  

  

  Absolute 
  

   Pressure 
  

  

  in 
  lbs. 
  

   Der 
  sq. 
  in. 
  

  

  Tempe- 
  j 
  

   rature 
  of 
  ; 
  

   Gas 
  in 
  

   degi-ees 
  

   cent.* 
  

  

  Time 
  

  

  in 
  

  

  seconds. 
  

  

  2-2 
  

  

  Reading 
  

  

  in 
  

   millims. 
  

  

  Absolute 
  

  

  Pressure 
  

  

  in 
  lbs. 
  

  

  jer 
  sq. 
  in. 
  

  

  Tempe- 
  

   rature 
  of 
  

   Gas 
  in 
  

   degrees 
  

   cent.* 
  

  

  0*08 
  

  

  23*54 
  

  

  9618 
  

  

  2483 
  

  

  5-68 
  

  

  2979 
  

  

  581 
  

  

  0*1 
  

  

  23*19 
  ! 
  

  

  9487 
  

  

  2445 
  

  

  2-3 
  

  

  5*54 
  

  

  2927 
  

  

  566 
  

  

  0*2 
  

  

  20*55 
  1 
  

  

  8506 
  

  

  2164 
  

  

  2-4 
  

  

  5*32 
  

  

  2845 
  

  

  542 
  

  

  0*3 
  

  

  18-62 
  ; 
  

  

  7789 
  

  

  1957 
  

  

  2-5 
  

  

  5*13 
  

  

  2774 
  

  

  522 
  

  

  0*4 
  

  

  16-95 
  ! 
  

  

  7167 
  

  

  1781 
  

  

  2-6 
  

  

  5-00 
  

  

  2726 
  

  

  508 
  

  

  0*5 
  

  

  15 
  83 
  

  

  6751 
  

  

  1661 
  

  

  2*7 
  

  

  4-83 
  

  

  2663 
  

  

  490 
  

  

  0-6 
  

  

  14-78 
  

  

  6361 
  

  

  1548 
  

  

  2-8 
  

  

  4*68 
  

  

  2607 
  

  

  474 
  

  

  0*7 
  

  

  1379 
  

  

  5993 
  

  

  1445 
  

  

  2-9 
  

  

  4*51 
  

  

  2544 
  

  

  456 
  

  

  0-8 
  

  

  12-82 
  

  

  5632 
  

  

  1341 
  

  

  30 
  

  

  4*35 
  

  

  2484 
  

  

  439 
  

  

  09 
  

  

  11-92 
  

  

  529S 
  

  

  1245 
  ; 
  

  

  3-5 
  

  

  3-82 
  

  

  2287 
  

  

  382 
  

  

  1*0 
  

  

  11*08 
  

  

  498(5 
  

  

  1156 
  

  

  40 
  

  

  333 
  

  

  2094 
  

  

  327 
  

  

  11 
  

  

  10-38 
  

  

  4726 
  

  

  1081 
  

  

  4o 
  

  

  2-96 
  

  

  1968 
  

  

  291 
  

  

  1*2 
  

  

  9-72 
  

  

  4481 
  

  

  1011 
  

  

  5-0 
  

  

  272 
  

  

  1878 
  

  

  265 
  

  

  1*3 
  

  

  9-20 
  

  

  4287 
  

  

  955 
  

  

  60 
  

  

  2-47 
  

  

  1785 
  

  

  239 
  

  

  1*4 
  

  

  8-68 
  

  

  4094 
  

  

  900 
  

  

  70 
  

  

  216 
  

  

  1670 
  

  

  205 
  

  

  1*5 
  

  

  8*16 
  

  

  3901 
  

  

  845 
  

  

  8-0 
  

  

  1-95 
  

  

  1592 
  

  

  183 
  

  

  1*6 
  

  

  7*68 
  

  

  3722 
  

  

  793 
  

  

  9-0 
  

  

  1*74 
  

  

  1514 
  

  

  161 
  

  

  1*7 
  

  

  7*30 
  

  

  3581 
  

  

  753 
  

  

  100 
  

  

  1-54 
  

  

  1439 
  

  

  139 
  

  

  1*8 
  

  

  6-86 
  

  

  3118 
  

  

  706 
  

  

  110 
  

  

  1-43 
  

  

  1399 
  

  

  128 
  

  

  1*9 
  

  

  6*54 
  

  

  3299 
  

  

  672 
  

  

  120 
  

  

  1*32 
  

  

  1358 
  

  

  106 
  

  

  2*0 
  

  

  6-23 
  

  

  3183 
  

  

  639 
  

  

  15*0 
  

  

  115 
  

  

  1295 
  

  

  98 
  

  

  21 
  

  

  5*95 
  

  

  3079 
  

  

  609 
  

  

  

  

  

  

  * 
  The 
  temperatures 
  in 
  this 
  column 
  are 
  calculated 
  in 
  the 
  usual 
  manner 
  from 
  

   the 
  pressure 
  allowing 
  for 
  the 
  quantity 
  of 
  water-vapour 
  formed. 
  

  

  