﻿790 
  Mr. 
  T. 
  H. 
  Laby: 
  A 
  Recalculation 
  of 
  

  

  combining 
  all 
  the 
  existing 
  observations. 
  It 
  appeared, 
  then, 
  

   that 
  a 
  reduction 
  of 
  these 
  numerous 
  observations 
  would 
  be 
  of 
  

   value. 
  

  

  The 
  existing 
  Data. 
  

  

  The 
  results 
  of 
  the 
  following 
  observers, 
  which 
  are 
  quoted 
  

   in 
  Table 
  II. 
  after 
  their 
  initial 
  letters, 
  have 
  been 
  obtained 
  by 
  

   varied 
  methods 
  as 
  indicated 
  below 
  : 
  — 
  

  

  H. 
  — 
  Hertz 
  (Wied. 
  Ann. 
  1882, 
  xvii. 
  p. 
  193) 
  : 
  Statical 
  method 
  and 
  

   mercury 
  in 
  glass 
  thermometer 
  corrected 
  by 
  a 
  Joly 
  air- 
  

   thermometer. 
  

   RY. 
  — 
  Ramsay 
  & 
  Young 
  (Trans. 
  1886, 
  xlix. 
  p. 
  37) 
  ; 
  Young 
  (Trans. 
  

   1891, 
  lix. 
  p. 
  629) 
  : 
  Dynamical 
  method, 
  temperatures 
  ob- 
  

   tained 
  by 
  vapour-jackets 
  of 
  aniline, 
  quinoline, 
  &c. 
  boiling 
  

   at 
  known 
  pressures. 
  

   CG.— 
  Callendar 
  & 
  Griffiths 
  (Phil. 
  Trans. 
  1891, 
  clxxxii. 
  p. 
  151): 
  

   Boiling-point 
  of 
  mercury 
  by 
  platinum 
  thermometers 
  in 
  

   terms 
  of 
  constant-pressure 
  air-thermometer. 
  

  

  P.— 
  Pfaundler 
  (Wied. 
  Ann. 
  1897, 
  lxiii. 
  p. 
  36) 
  : 
  Absorption 
  (by 
  

   silver) 
  of 
  mercury 
  from 
  a 
  stream 
  of 
  air 
  saturated 
  with 
  it. 
  

  

  M 
  E. 
  W. 
  Morley 
  (Phil. 
  Mag. 
  [6] 
  vii. 
  p. 
  662, 
  June 
  1904) 
  : 
  Loss 
  

  

  of 
  weight 
  of 
  mercury 
  saturator 
  on 
  passing 
  carbon 
  dioxide 
  

   through 
  it. 
  

  

  G.— 
  A. 
  Gebhardt 
  (Verhand. 
  Deut. 
  Phys. 
  Ges. 
  1905, 
  viii. 
  pp. 
  184- 
  

   188, 
  and 
  Diss. 
  Univ. 
  Erlanger, 
  1904) 
  : 
  Dynamical 
  method, 
  

   lower 
  pressures 
  measured 
  with 
  a 
  McLeod 
  gauge. 
  

  

  C. 
  — 
  Cailletet, 
  Colardeau, 
  & 
  Riviere 
  (Compt.-rend. 
  1900, 
  cxxx. 
  

   p. 
  1585) 
  : 
  Static 
  method, 
  thermojunction, 
  and 
  metallic 
  

   manometer 
  calibrated 
  by 
  open-air 
  manometer. 
  

  

  Few 
  of 
  the 
  observers 
  are 
  explicit 
  as 
  to 
  their 
  unit 
  of 
  pressure, 
  

   and 
  no 
  mention 
  of 
  the 
  value 
  of 
  g 
  for 
  the 
  place 
  of 
  observation 
  

   has 
  been 
  found. 
  The 
  latter 
  omission 
  is 
  unimportant 
  as 
  few 
  

   of 
  the 
  observations 
  are 
  correct 
  to 
  1 
  in 
  1000 
  ; 
  but 
  it 
  is 
  more 
  

   important 
  to 
  know 
  that 
  mm. 
  of 
  mercurv 
  means 
  mercurv 
  at 
  

   0°C. 
  

  

  Regnault's 
  observations 
  have 
  not 
  been 
  used, 
  as 
  he 
  distinctly 
  

   states 
  they 
  are 
  only 
  approximate, 
  and 
  Ramsay 
  & 
  Young 
  (loc. 
  

   cit.) 
  have 
  given 
  reasons 
  for 
  doubting 
  their 
  accuracy. 
  Nor 
  

   have 
  I 
  used 
  the 
  results 
  of 
  the 
  elaborate 
  experiments 
  of 
  

   "Van 
  der 
  Plaats 
  *, 
  who 
  was 
  the 
  first 
  to 
  absorb 
  mercury 
  from 
  

   a 
  stream 
  of 
  gas 
  saturated 
  with 
  mercury 
  vapour, 
  nor 
  those 
  

   of 
  Hagen 
  f 
  and 
  of 
  McLeod 
  J, 
  which 
  differ 
  widely 
  from 
  the 
  

   values 
  deduced 
  from 
  the 
  concordant 
  observations 
  of 
  Hertz, 
  

   Pfaundler, 
  and 
  Morley. 
  This 
  want 
  of 
  agreement 
  is 
  shown 
  

   in 
  Table 
  I. 
  

  

  * 
  Sec. 
  Trav. 
  Chim. 
  1886, 
  v. 
  pp. 
  149-182. 
  

  

  t 
  Wied. 
  Ann. 
  1882, 
  xvi. 
  p. 
  610. 
  J 
  Brit. 
  Assoc. 
  Rep. 
  1883, 
  p. 
  443. 
  

  

  