﻿42 
  Prof. 
  Chattock 
  and 
  Mr. 
  Tyndall 
  on 
  Changes 
  

  

  Air 
  in 
  Hydrogen. 
  

   It 
  was 
  interesting 
  to 
  apply 
  the 
  same 
  argument 
  to 
  the 
  air 
  

   series 
  (Curves 
  VII. 
  dots) 
  which 
  was 
  taken 
  directly 
  after 
  the 
  

   second 
  nitrogen 
  series, 
  as 
  the 
  amount 
  of 
  oxygen 
  present 
  was 
  

   there 
  known. 
  

   i 
  Curves 
  VIT. 
  — 
  Air 
  in 
  Hydrogen. 
  

  

  Only 
  two 
  percentages 
  happen 
  to 
  have 
  been 
  taken 
  up 
  to 
  the 
  

   drop, 
  and 
  of 
  these 
  only 
  the 
  second 
  (O006 
  per 
  cent, 
  of 
  air) 
  is 
  

   reliable. 
  Calculating 
  from 
  this 
  the 
  percentage 
  of 
  oxygen 
  

   present 
  in 
  the 
  air, 
  we 
  obtain 
  17. 
  

  

  A 
  second 
  set 
  of 
  air 
  discharges 
  (Curves 
  VII. 
  circles) 
  was 
  

   taken 
  after 
  the 
  point 
  had 
  been 
  cleaned 
  by 
  heating 
  to 
  bright 
  

   redness, 
  and 
  from' 
  this 
  the 
  numbers 
  in 
  Table 
  5 
  were 
  calculated. 
  

  

  Table 
  

  

  .). 
  

  

  + 
  Discharge. 
  

  

  — 
  Discharge. 
  

  

  P. 
  

  

  P'. 
  

  

  P. 
  

  

  P'. 
  

  

  00023 
  

  

  20 
  

  

  00035 
  

  

  19 
  

  

  •0070 
  

  

  18 
  

  

  0149 
  

  

  19 
  

  

  •0139 
  

  

  17? 
  

  

  0361 
  

  

  21 
  

  

  

  

  •0527 
  

  

  21 
  

  

  