﻿384: 
  

  

  CORRECTION 
  TO 
  BAROMETER 
  FOR 
  FORCE 
  OF 
  WIND. 
  

  

  above 
  the 
  mean 
  level 
  of 
  the 
  sea 
  25 
  feet, 
  the 
  wind 
  blowing 
  with 
  a 
  force 
  of 
  6 
  lb. 
  

   per 
  square 
  foot, 
  the 
  value 
  of 
  the 
  corrections 
  will 
  be, 
  

  

  Capillarity, 
  . 
  

  

  + 
  •021 
  

  

  Temperature, 
  

  

  -•023 
  

  

  Capacity, 
  

  

  -•007 
  

  

  For 
  altitude, 
  

  

  + 
  -034 
  

  

  Force 
  of 
  wind, 
  

  

  + 
  •035 
  

  

  It 
  will 
  thus 
  be 
  seen 
  that 
  the 
  correction 
  for 
  the 
  force 
  of 
  the 
  wind, 
  in 
  the 
  sup- 
  

   posed 
  case, 
  would 
  be 
  greater 
  than 
  any 
  of 
  those 
  hitherto 
  considered 
  absolutely 
  

   necessary 
  for 
  a 
  strict 
  comparison, 
  and, 
  consequently, 
  that 
  it 
  is 
  an 
  element 
  which 
  

   cannot 
  properly 
  be 
  neglected 
  ; 
  but 
  I 
  beg 
  to 
  repeat 
  that 
  I 
  do 
  not 
  give 
  the 
  depres- 
  

   sions 
  corresponding 
  to 
  the 
  force 
  of 
  the 
  wind 
  as 
  absolutely 
  determined, 
  even 
  for 
  

   the 
  short 
  range 
  I 
  have 
  observed 
  ; 
  and 
  it 
  is 
  possible 
  that 
  in 
  towns 
  and 
  other 
  shel- 
  

   tered 
  places, 
  the 
  results 
  would 
  be 
  different. 
  My 
  object 
  is 
  to 
  draw 
  the 
  attention 
  of 
  

   meteorologists 
  to 
  the 
  facts 
  stated, 
  in 
  the 
  hope 
  that 
  by 
  more 
  extended 
  observations 
  

   we 
  may 
  obtain 
  more 
  accurate 
  data 
  ; 
  and 
  it 
  is 
  important 
  that 
  their 
  attention 
  

   should 
  be 
  drawn 
  to 
  this 
  subject 
  at 
  this 
  time, 
  when 
  I 
  trust 
  we 
  are 
  on 
  the 
  eve 
  of 
  

   seeing 
  established 
  a 
  uniform 
  system 
  of 
  observation 
  and 
  registry 
  for 
  the 
  world, 
  

   under 
  the 
  sanction 
  of 
  the 
  several 
  governments, 
  and 
  promulgated 
  by 
  the 
  authority 
  

   of 
  a 
  congress 
  of 
  the 
  most 
  eminent 
  men 
  in 
  meteorological 
  science, 
  from 
  all 
  parts 
  

   of 
  the 
  world. 
  

  

  The 
  practical 
  importance 
  of 
  the 
  study 
  of 
  meteorology 
  is 
  daily 
  becoming 
  more 
  

   evident 
  by 
  the 
  results 
  obtained 
  by 
  Mr 
  Redfield 
  and 
  Colonel 
  Sir 
  W. 
  Reid 
  from 
  

   the 
  study 
  of 
  the 
  law 
  of 
  storms, 
  by 
  the 
  results 
  obtained 
  by 
  the 
  wind 
  and 
  current- 
  

   charts 
  of 
  Lieutenant 
  Maury, 
  the 
  astronomer 
  at 
  Washington, 
  and 
  in 
  the 
  true 
  in- 
  

   dications, 
  as 
  I 
  believe, 
  which 
  the 
  isothermal 
  lines 
  give 
  of 
  the 
  most 
  accessible 
  route 
  

   to 
  the 
  open 
  Polar 
  Sea, 
  and 
  the 
  pole 
  itself, 
  as 
  explained 
  by 
  Mr 
  Petermann, 
  not 
  to 
  

   speak 
  of 
  the 
  accurate 
  data 
  which 
  meteorology 
  gives 
  us 
  for 
  understanding 
  the 
  

   peculiarities 
  of 
  the 
  climates 
  of 
  the 
  different 
  parts 
  of 
  the 
  world, 
  the 
  causes 
  favour- 
  

   able 
  or 
  otherwise 
  to 
  the 
  health 
  of 
  man, 
  or 
  the 
  necessary 
  conditions 
  for 
  the 
  suc- 
  

   cessful 
  cultivation 
  of 
  the 
  different 
  products 
  of 
  the 
  earth, 
  or 
  the 
  high 
  interest 
  which 
  

   must 
  ever 
  attach 
  to 
  the 
  purely 
  scientific 
  branch 
  of 
  this 
  inquiry 
  ; 
  but 
  we 
  can 
  never 
  

   arrive 
  at 
  a 
  full 
  understanding 
  of 
  these 
  important 
  subjects 
  without 
  that 
  combined 
  

   and 
  uniform 
  s}^stem 
  which 
  has 
  been 
  proposed. 
  

  

  I 
  cannot 
  terminate 
  these 
  remarks 
  better 
  than 
  by 
  quoting 
  the 
  words 
  of 
  Pro- 
  

   fessor 
  Daniell 
  in 
  " 
  an 
  urgent 
  recommendation 
  to 
  meteorologists 
  to 
  use 
  standard 
  

   instruments, 
  to 
  observe 
  them 
  with 
  care, 
  and 
  to 
  make 
  all 
  necessary 
  corrections 
  for 
  

   accidental 
  differences; 
  and, 
  above 
  all, 
  to 
  keep 
  their 
  tables 
  on 
  the 
  same 
  scheme. 
  

   Much 
  curious 
  information 
  is 
  dependent 
  upon 
  such 
  an 
  extensive 
  plan 
  of 
  compara- 
  

   tive 
  observation 
  ; 
  and, 
  without 
  it, 
  the 
  observer 
  does 
  little 
  more 
  than 
  accumulate 
  

   an 
  overwhelming 
  mass 
  of 
  crude 
  and 
  incorrect 
  materials." 
  

  

  