﻿INDEXED, 
  

  

  THE 
  

   LONDON, 
  EDINBURGH, 
  and 
  DUBLIN 
  

  

  PHILOSOPHICAL 
  MAGAZINE 
  

  

  AND 
  

  

  JOURNAL 
  OF 
  SCI 
  

  

  [SIXTH 
  SERIES.] 
  

  

  MAY 
  1902. 
  

  

  LIII. 
  A 
  Recording 
  Manometer 
  for 
  High- 
  Pressure 
  JE^fpfions. 
  { 
  

   By 
  J. 
  E. 
  Petavel, 
  Harling 
  Fellow 
  of 
  the 
  Owens 
  

   Manchester 
  *. 
  

  

  [Plates 
  IX. 
  & 
  X.] 
  

  

  Introduction. 
  

  

  THE 
  study 
  of 
  the 
  phenomena 
  which 
  take 
  place 
  during 
  an 
  

   explosion 
  is 
  of 
  considerable 
  importance 
  both 
  from 
  a 
  

   theoretical 
  and 
  practical 
  point 
  of 
  view. 
  An 
  exact 
  knowledge 
  

   of 
  the 
  variation 
  of 
  pressure 
  will 
  provide 
  information 
  on 
  the 
  

   rate 
  of 
  cooling 
  of 
  gases 
  under 
  high 
  pressures, 
  on 
  the 
  variation 
  

   •of 
  specific 
  heat 
  at 
  high 
  temperatures, 
  and 
  on 
  the 
  question 
  of 
  

   dissociation. 
  

  

  From 
  a 
  practical 
  point 
  of 
  view 
  such 
  information 
  is 
  needed 
  

   in 
  the 
  design 
  of 
  modern 
  artillery, 
  and 
  in 
  all 
  problems 
  con- 
  

   nected 
  with 
  ballistics. 
  It 
  enables 
  the 
  civil 
  engineer 
  to 
  select 
  

   the 
  explosive 
  suitable 
  for 
  the 
  purpose 
  to 
  be 
  attained. 
  It 
  

   guides 
  the 
  mechanical 
  engineer 
  in 
  the 
  design 
  of 
  the 
  heat- 
  

   engine. 
  

  

  Brief 
  Historical 
  Account. 
  

  

  It 
  is 
  impossible 
  within 
  the 
  scope 
  of 
  the 
  present 
  paper 
  to 
  

   give 
  more 
  than 
  an 
  enumeration 
  of 
  the 
  principal 
  devices 
  which 
  

   have 
  been 
  used 
  for 
  the 
  measurement 
  of 
  explosive 
  pressures. 
  

   The 
  first 
  systematic 
  experiments 
  were 
  carried 
  out 
  by 
  Robins 
  

  

  * 
  Communicated 
  by 
  the 
  Author. 
  Read 
  before 
  the 
  Manchester 
  Literary 
  

   and 
  Philosophical 
  Society 
  on 
  November 
  26th 
  ; 
  1901. 
  

  

  Phil. 
  Mag. 
  S. 
  6. 
  Vol. 
  3. 
  No. 
  17. 
  May 
  1902. 
  2 
  I 
  

  

  