﻿the 
  Absolute 
  Scale 
  of 
  Temperature. 
  377 
  

  

  For 
  carbon 
  dioxide 
  the 
  values 
  of 
  e 
  were 
  read 
  off' 
  the 
  curve 
  

   of 
  Joule 
  and 
  Thomson's 
  results, 
  and 
  then 
  reduced 
  in 
  pro- 
  

   portion, 
  so 
  as 
  to 
  give 
  0*728 
  over 
  the 
  range 
  0" 
  

   accordance 
  with 
  Chappuis's 
  measurements. 
  

  

  v 
  = 
  388c.c. 
  

  

  to 
  100°, 
  in 
  

  

  t. 
  

  

  Mean 
  of 
  e 
  

   0° 
  to 
  t°. 
  

  

  Mean 
  of 
  Kp 
  

   0° 
  to 
  t°. 
  

  

  - 
  Kpe/y. 
  

  

  10 
  

   20 
  

   30 
  

  

  -0986 
  

   •955 
  

   •924 
  

  

  8-05 
  xlO 
  6 
  

  

  810 
  

  

  8-15 
  

  

  10206 
  

  

  200 
  

   195 
  

  

  40 
  

   50 
  

   60 
  

  

  •893 
  

   •861 
  

   •830 
  

  

  8-20 
  

   8-25 
  

   831 
  

  

  190 
  

   185 
  

   180 
  

  

  70 
  

   80 
  

   90 
  

  

  •798 
  

   •775 
  

   •751 
  

  

  8-36 
  

   8-42 
  

  

  8-47 
  

  

  175 
  

   170 
  

   165 
  

  

  100 
  

  

  •728 
  

  

  8-52 
  

  

  160 
  

  

  The 
  results 
  of 
  equation 
  (vii.) 
  are 
  as 
  follows 
  : 
  — 
  

  

  T-T 
  . 
  

  

  *H* 
  

  

  %. 
  

  

  tco 
  2 
  - 
  

  

  tm. 
  

  

  10 
  

  

  9-999 
  

  

  10005 
  

  

  10-022 
  

  

  10-051 
  

  

  20 
  

  

  19-998 
  

  

  20-009 
  

  

  20 
  040 
  

  

  20-083 
  

  

  30 
  

  

  29-998 
  

  

  30-012 
  

  

  30054 
  

  

  30101 
  

  

  40 
  

  

  39-997 
  

  

  40-014 
  

  

  40-065 
  

  

  40107 
  

  

  50 
  

  

  49-997 
  

  

  50-016 
  

  

  50071 
  

  

  50-105 
  

  

  60 
  

  

  59-997 
  

  

  60016 
  

  

  60-070 
  

  

  60-094 
  

  

  70 
  

  

  69-998 
  

  

  70015 
  

  

  70-064 
  

  

  70078 
  

  

  80 
  

  

  79-998 
  

  

  80-013 
  

  

  80050 
  

  

  80056 
  

  

  90 
  

  

  89-999 
  

  

  90-009 
  

  

  90-030 
  

  

  90031 
  

  

  This 
  table 
  shows 
  the 
  readings 
  of 
  the 
  hydrogen, 
  nitrogen, 
  

   carbon 
  dioxide, 
  and 
  the 
  Paris 
  mercury 
  thermometer 
  for 
  each 
  

   ten 
  degrees 
  on 
  the 
  absolute 
  scale 
  : 
  the 
  last 
  column 
  is 
  obtained 
  

   from 
  the 
  direct 
  comparison 
  of 
  the 
  mercury 
  with 
  the 
  hydrogen 
  

   and 
  nitrogen 
  thermometers, 
  combined 
  with 
  my 
  reduction 
  of 
  

   the 
  latter 
  to 
  the 
  absolute 
  scale. 
  

  

  In 
  order 
  to 
  judge 
  of 
  the 
  value 
  of 
  the 
  results, 
  the 
  followin 
  ci- 
  

   table 
  shows, 
  in 
  parallel 
  columns, 
  the 
  difference 
  in 
  readino- 
  

   between 
  each 
  pair 
  of 
  gas 
  thermometers 
  (1) 
  as 
  calculated 
  in 
  

   this 
  memoir 
  ; 
  (2) 
  as 
  observed 
  by 
  direct 
  comparison 
  at 
  Paris, 
  

  

  