﻿ARTICLE 
  XXIII. 
  

  

  Of 
  an 
  Improved 
  Barometer 
  Gage 
  Eudiometer. 
  By 
  R. 
  Hare, 
  M. 
  D., 
  

   fyc, 
  fyc, 
  fyc. 
  

  

  About 
  eight 
  years 
  ago 
  I 
  published 
  an 
  account 
  of 
  a 
  hydro-oxygen 
  

   eudiometer, 
  in 
  which 
  the 
  measurement 
  of 
  the 
  gases 
  was 
  effected 
  by 
  

   means 
  of 
  a 
  barometer 
  gage. 
  In 
  the 
  apparatus 
  then 
  employed, 
  the 
  re- 
  

   ceiver 
  was 
  of 
  glass, 
  and 
  was, 
  of 
  course, 
  fragile. 
  Subsequently 
  I 
  em- 
  

   ployed 
  a 
  stout 
  iron 
  bottle 
  in 
  lieu 
  of 
  the 
  glass. 
  

  

  The 
  essential 
  constituents 
  of 
  this 
  apparatus 
  are 
  an 
  air 
  tight 
  vessel, 
  

   sufficiently 
  strong, 
  and 
  having 
  screw 
  apertures 
  for 
  the 
  insertion 
  of 
  

   valve 
  cocks, 
  V 
  V 
  V, 
  a 
  thermometer 
  T, 
  and 
  a 
  galvano 
  ignition 
  ap- 
  

   paratus* 
  W 
  W 
  ; 
  also 
  a 
  barometer 
  gage 
  G, 
  communicating 
  by 
  a 
  leaden 
  

   tube 
  with 
  the 
  vessel 
  through 
  one 
  of 
  the 
  valve 
  cocks. 
  

  

  An 
  air 
  pump, 
  pneumatic 
  cistern 
  or 
  trough, 
  and 
  reservoirs 
  for 
  gas, 
  are 
  

   necessary 
  auxiliaries. 
  

  

  It 
  is 
  an 
  important 
  characteristic 
  of 
  the 
  barometer 
  gage 
  eudiometer, 
  

   that 
  it 
  is 
  applicable 
  on 
  a 
  much 
  larger 
  scale 
  than 
  any 
  other. 
  It 
  is 
  

   only 
  necessary 
  to 
  make 
  the 
  requisite 
  apertures, 
  and 
  tap 
  them 
  for 
  ap- 
  

   propriate 
  screws, 
  in 
  order 
  to 
  transfer 
  the 
  valve 
  cocks, 
  thermometer 
  and 
  

   ignition 
  apparatus, 
  with 
  all 
  the 
  essential 
  means 
  of 
  operating, 
  to 
  any 
  air 
  

   tight 
  cylinder 
  of 
  any 
  size 
  ; 
  to 
  a 
  large 
  cannon 
  for 
  instance, 
  the 
  mouth 
  

  

  * 
  This 
  is 
  the 
  name 
  by 
  which 
  I 
  have 
  designated 
  it 
  in 
  ray 
  text 
  book. 
  

   VOL. 
  v. 
  — 
  4 
  z 
  

  

  