﻿292 
  

  

  PROFESSOR 
  WILLIAM 
  THOMSON 
  ON 
  THE 
  

  

  Col. 
  1. 
  

  

  Col. 
  2. 
  

  

  Col. 
  3. 
  

  

  Col. 
  4. 
  

  

  Temperature. 
  

  

  Values 
  of 
  p 
  according 
  

   to 
  assumed 
  density 
  

   of 
  saturated 
  steam. 
  

  

  Values 
  of 
  /x. 
  according 
  

   to 
  Joule's 
  formula. 
  

  

  Values 
  of 
  p. 
  according 
  

   to 
  modified 
  assump- 
  

   tion 
  for 
  density 
  of 
  

   saturated 
  steam 
  

  

  t 
  

  

  M 
  

  

  J 
  E 
  

  

  J 
  l 
  + 
  Et 
  

  

  17176 
  . 
  . 
  

   1693-5 
  * 
  M 
  

  

  

  

  4-967 
  

  

  5-087 
  

  

  5-038 
  

  

  10 
  

  

  ' 
  4-832 
  

  

  4-908 
  

  

  4-901 
  

  

  20 
  

  

  4-703 
  

  

  4-740 
  

  

  4-769 
  

  

  30 
  

  

  4-578 
  

  

  4-584 
  

  

  4-643 
  

  

  40 
  

  

  4-456 
  

  

  4-438 
  

  

  4-519 
  

  

  50 
  

  

  4-337 
  

  

  4-300 
  

  

  4-399 
  

  

  60 
  

  

  4-221 
  

  

  4-171 
  

  

  4-281 
  

  

  70 
  

  

  4-114 
  

  

  4-050 
  

  

  4-172 
  

  

  80 
  

  

  4-013 
  

  

  3-935 
  

  

  4070 
  

  

  90 
  

  

  3-921 
  

  

  3-827 
  

  

  3-977 
  

  

  100 
  

  

  3-833 
  

  

  3-724 
  

  

  3-887 
  

  

  110 
  

  

  3-753 
  

  

  3-627 
  

  

  3-806 
  

  

  120 
  

  

  3-679 
  

  

  3-535 
  

  

  3-731 
  

  

  130 
  

  

  3-611 
  

  

  3-447 
  

  

  3-662 
  

  

  140 
  

  

  3-546 
  

  

  3-364 
  

  

  3-596 
  

  

  150 
  

  

  3-487 
  

  

  3-284 
  

  

  3-536 
  

  

  160 
  

  

  3-432 
  

  

  3-209 
  

  

  3-481 
  

  

  170 
  

  

  3-382 
  

  

  3136 
  

  

  3-430 
  

  

  180 
  

  

  3-335 
  

  

  3-067 
  

  

  3-382 
  

  

  190 
  

  

  3-289 
  

  

  3001 
  

  

  3-336 
  

  

  200 
  

  

  3247 
  

  

  2-937 
  

  

  3-293 
  

  

  210 
  

  

  3-208 
  

  

  2-876 
  

  

  3-254 
  

  

  220 
  

  

  3171 
  

  

  2-818 
  

  

  3-216 
  

  

  230 
  

  

  3135 
  

  

  2-762 
  

  

  3-179 
  

  

  Mr 
  Joule, 
  when 
  I 
  pointed 
  out 
  these 
  discrepancies 
  to 
  him 
  in 
  the 
  year 
  1848, 
  

   suggested 
  that 
  even 
  between 
  0° 
  and 
  100°, 
  the 
  inaccuracy 
  of 
  the 
  data 
  regarding 
  

   steam 
  might 
  be 
  sufficient 
  to 
  account 
  for 
  them. 
  I 
  think 
  it 
  will 
  be 
  generally 
  ad- 
  

   mitted 
  that 
  there 
  can 
  be 
  no 
  such 
  inaccuracy 
  in 
  Regnault's 
  part 
  of 
  the 
  data, 
  and 
  

   there 
  remains 
  only 
  the 
  uncertainty 
  regarding 
  the 
  density 
  of 
  saturated 
  steam, 
  to 
  

  

  prevent 
  the 
  conclusion 
  that 
  /jl 
  cannot 
  be 
  expressed 
  by 
  J^ 
  — 
  ^-', 
  so 
  that 
  Mayer's 
  

  

  hypothesis 
  would 
  be 
  confirmed 
  if, 
  and 
  overturned 
  unless, 
  the 
  density 
  of 
  saturated 
  

   steam, 
  instead 
  of 
  following 
  the 
  gaseous 
  laws, 
  were 
  truly 
  expressed 
  by 
  the 
  equations 
  

  

  <7 
  = 
  

  

  (e 
  + 
  ')&*] 
  

  

  • 
  [o-] 
  

  

  (ID 
  

  

  [*] 
  = 
  

  

  1 
  + 
  Exl00 
  

  

  16935 
  " 
  1 
  + 
  E* 
  

  

  where 
  [/*] 
  denotes 
  the 
  quantity 
  tabulated 
  for 
  the 
  temperatures 
  0°, 
  1°, 
  2°, 
  . 
  . 
  . 
  230° 
  

   in 
  Table 
  I. 
  of 
  my 
  Account 
  of 
  Carnot's 
  Theory 
  ; 
  and 
  \jt] 
  denotes 
  the 
  density 
  of 
  sa- 
  

   turated 
  steam 
  which 
  was 
  assumed 
  in 
  the 
  calculation 
  of 
  that 
  Table, 
  the 
  values 
  of 
  ^ 
  

  

  