﻿82 
  

  

  Report 
  of 
  the 
  Kew 
  Committee. 
  

  

  Meteorological 
  Work. 
  — 
  The 
  several 
  automatic 
  arrangements 
  for 
  record- 
  

   ing 
  respectively 
  the 
  Barometer, 
  the 
  Dry- 
  and 
  Wet-Bulb 
  Thermometers, 
  

   the 
  Anemometer, 
  and 
  the 
  Rain-gauge, 
  have 
  been 
  maintained 
  in 
  constant 
  

   action 
  under 
  the 
  superintendence 
  of 
  Mr. 
  T. 
  W. 
  Baker, 
  assisted 
  by 
  Mr. 
  

   Foster 
  and 
  Mr. 
  Figg 
  ; 
  and 
  the 
  daily 
  standard 
  eye-observations 
  for 
  control 
  

   of 
  the 
  photographic 
  records 
  have 
  been 
  made 
  regularly. 
  

  

  The 
  instrumental 
  traces 
  with 
  hourly 
  tabulated 
  values 
  are 
  sent 
  monthly 
  

   to 
  the 
  Meteorological 
  Office 
  as 
  in 
  former 
  years. 
  The 
  Barograms 
  and 
  

   Thermograms 
  are 
  obtained 
  in 
  duplicate, 
  and 
  one 
  copy 
  is 
  preserved 
  at 
  Kew. 
  

   As 
  regards 
  the 
  Anemograms 
  and 
  Hyetograms, 
  the 
  copy 
  is 
  obtained 
  by 
  

   the 
  method 
  of 
  tracing. 
  

  

  In 
  addition 
  to 
  the 
  regular 
  work 
  of 
  Kew 
  as 
  one 
  of 
  the 
  self-recording 
  

   Observatories 
  in 
  connexion 
  with 
  the 
  Meteorological 
  Office, 
  the 
  duty 
  of 
  

   examining 
  and 
  checking 
  the 
  work 
  of 
  all 
  the 
  seven 
  Observatories 
  of 
  the 
  

   same 
  character 
  has 
  been 
  carried 
  on, 
  in 
  accordance 
  with 
  the 
  method 
  de- 
  

   scribed 
  in 
  the 
  Report 
  of 
  the 
  British 
  Association 
  for 
  1869. 
  This 
  portion 
  

   of 
  the 
  work 
  has 
  been 
  performed 
  by 
  Messrs. 
  Cullum, 
  Hawkesworth, 
  and 
  

   Deane. 
  

  

  A 
  series 
  of 
  investigations 
  have 
  been 
  conducted 
  with 
  the 
  view 
  of 
  testing 
  

   the 
  degree 
  of 
  accuracy 
  attainable 
  in 
  the 
  tabulation 
  of 
  the 
  Thermograms 
  

   by 
  the 
  process 
  described 
  in 
  the 
  British-Association 
  Report 
  just 
  referred 
  

   to. 
  It 
  has 
  been 
  found 
  to 
  be 
  an 
  improvement 
  to 
  set 
  the 
  glass 
  tabulating- 
  

   scale 
  by 
  means 
  of 
  fiducial 
  lines 
  traced 
  on 
  the 
  Thermograms 
  by 
  photo- 
  

   graphic 
  means, 
  in 
  preference 
  to 
  setting 
  it, 
  as 
  heretofore, 
  by 
  standard 
  

   readings. 
  The 
  great 
  advantage 
  derived 
  from 
  the 
  new 
  method 
  is 
  the 
  dis- 
  

   covery 
  of 
  " 
  bagging 
  " 
  whenever 
  it 
  exists 
  in 
  the 
  curves. 
  

  

  Electrometer. 
  — 
  The 
  Self-recording 
  E]ectrometer, 
  which 
  had 
  been 
  taken 
  

   to 
  Glasgow 
  for 
  alteration, 
  as 
  described 
  in 
  last 
  Report, 
  was 
  returned 
  by 
  

   Mr. 
  White 
  in 
  February, 
  and 
  was 
  adjusted 
  for 
  action 
  on 
  March 
  10. 
  It 
  

   has 
  since 
  continued 
  in 
  satisfactory 
  working 
  order. 
  

  

  PJiotoheliograpli. 
  — 
  A 
  necessity 
  for 
  reexamining 
  the 
  measurements 
  of 
  the 
  

   series 
  of 
  Kew 
  sun-pictures 
  having 
  arisen, 
  they 
  have 
  been 
  retransferred 
  to 
  

   Kew 
  by 
  Mr. 
  De 
  La 
  Rue, 
  and 
  their 
  reexamination 
  has 
  been 
  undertaken, 
  

   at 
  his 
  expense, 
  by 
  Mr. 
  Whipple, 
  assisted 
  by 
  Mr. 
  M'Laughlin, 
  who 
  has 
  

   been 
  temporarily 
  engaged 
  for 
  this 
  purpose. 
  

  

  ■ 
  The 
  eye-observations 
  of 
  .the 
  sun, 
  after 
  the 
  method 
  of 
  Hofrath 
  Schwabe, 
  

   have 
  been 
  made 
  daily 
  by 
  Mr. 
  Foster, 
  when 
  possible, 
  as 
  described 
  in 
  the 
  

   Report 
  for 
  1872, 
  in 
  order, 
  for 
  the 
  present, 
  to 
  maintain 
  the 
  continuity 
  of 
  

   the 
  Kew 
  record 
  of 
  sun-spots. 
  

  

  Extra 
  Observations. 
  — 
  The 
  Committee, 
  at 
  the 
  request 
  of 
  Prof. 
  Roscoe, 
  

   F.R.S., 
  undertook 
  to 
  test 
  for 
  a 
  year 
  an 
  instrument 
  which 
  he 
  had 
  devised 
  

   for 
  measuring 
  the 
  chemical 
  intensity 
  of 
  daylight, 
  as 
  described 
  in 
  the 
  ' 
  Pro- 
  

   ceedings 
  of 
  the 
  Royal 
  Society,' 
  vol. 
  xxii. 
  p. 
  158. 
  The 
  apparatus 
  was 
  

   completed 
  for 
  trial 
  in 
  September, 
  but 
  a 
  few 
  preliminary 
  experiments 
  

   showed 
  that 
  it 
  required 
  further 
  adjustment 
  ; 
  so 
  that 
  operations 
  in 
  this 
  

  

  