﻿84 
  

  

  Report 
  of 
  the 
  Kew 
  Committee. 
  

  

  Thermometers, 
  ordinary 
  Meteorological 
  1471 
  

  

  „ 
  Boiling-point 
  Standards 
  22 
  

  

  Mountain 
  32 
  

  

  Clinical 
  1255 
  

  

  2780 
  

  

  In 
  addition, 
  thirty-six 
  Thermometers 
  have 
  been 
  tested 
  at 
  the 
  freezing- 
  

   point 
  of 
  mercury, 
  and 
  one 
  metallic 
  Thermometer 
  has 
  been 
  tested. 
  

  

  Eighteen 
  Kew 
  Standard 
  Thermometers 
  hare 
  been 
  calibrated 
  and 
  di- 
  

   vided 
  at 
  Kew. 
  

  

  The 
  following 
  miscellaneous 
  instruments 
  have 
  also 
  been 
  verified 
  : 
  — 
  

  

  Rain-gauges 
  13 
  

  

  Robinson's 
  Dial 
  Anemometers 
  14 
  

  

  Telescope 
  1 
  

  

  Sextant 
  1 
  . 
  

  

  Theodolite 
  1 
  

  

  Hydrometers 
  66 
  

  

  A 
  Barograph 
  and 
  Thermograph 
  have 
  been 
  verified 
  for 
  Mr. 
  Kingston 
  

   for 
  the 
  Observatory 
  at 
  Toronto, 
  and 
  the 
  values 
  of 
  the 
  Scales 
  have 
  been 
  

   determined 
  as 
  far 
  as 
  practicable. 
  

  

  Experiments 
  have 
  been 
  made 
  with 
  a 
  view 
  to 
  the 
  construction 
  of 
  an 
  

   apparatus 
  devised 
  by 
  Mr. 
  P. 
  Gralton, 
  E.R.S., 
  for 
  facilitating 
  the 
  verifica- 
  

   tion 
  of 
  thermometers, 
  and 
  also 
  for 
  rendering 
  it 
  possible 
  to 
  extend 
  the 
  

   range 
  to 
  which 
  the 
  Kew 
  verifications 
  at 
  present 
  apply. 
  

  

  A 
  large 
  stock 
  of 
  filled 
  Thermometer-tubes 
  for 
  the 
  construction 
  of 
  

   Standards 
  has 
  been 
  laid 
  in, 
  and 
  the 
  tubes 
  have 
  been 
  annealed. 
  

  

  In 
  the 
  last 
  Report 
  mention 
  was 
  made 
  of 
  certain 
  experiments 
  in 
  pro- 
  

   gress 
  with 
  respect 
  to 
  the 
  testing 
  of 
  Anemometers, 
  a 
  piece 
  of 
  ground 
  

   having 
  been 
  rented 
  in 
  the 
  Park 
  for 
  erecting 
  the 
  instruments. 
  

  

  The 
  experience 
  of 
  a 
  few 
  months 
  was 
  sufficient 
  to 
  show 
  that 
  the 
  ex- 
  

   posure 
  in 
  the 
  Park 
  was 
  not 
  nearly 
  sufficiently 
  open 
  to 
  afford 
  facilities 
  for 
  

   testing 
  the 
  instruments 
  at 
  any 
  but 
  very 
  low 
  velocities, 
  and 
  not 
  very 
  

   satisfactorily 
  even 
  in 
  such 
  cases. 
  Application 
  was 
  therefore 
  made 
  to 
  the 
  

   Secretary 
  of 
  the 
  Crystal 
  Palace 
  Company 
  for 
  permission 
  to 
  employ 
  a 
  

   rotary 
  machine 
  driven 
  by 
  steam-power, 
  so 
  as 
  to 
  be 
  able 
  to 
  vary 
  the 
  velo- 
  

   cities 
  at 
  pleasure. 
  

  

  Consent 
  having 
  been 
  most 
  freely 
  given, 
  the 
  experiments 
  were 
  com- 
  

   menced, 
  and 
  the 
  instruments 
  tested 
  at 
  various 
  velocities 
  up 
  to 
  about 
  

   30 
  miles 
  an 
  hour, 
  the 
  highest 
  attainable 
  by 
  the 
  apparatus. 
  The 
  investi- 
  

   gations 
  were 
  interrupted 
  during 
  the 
  summer, 
  and 
  will 
  be 
  resumed 
  on 
  a 
  

   future 
  occasion. 
  It 
  is 
  hoped 
  that 
  by 
  this 
  method 
  of 
  artificial 
  rotation, 
  which 
  

   was 
  that 
  employed 
  by 
  Smeaton 
  in 
  his 
  experiments 
  on 
  windmill 
  sails, 
  

   more 
  satisfactory 
  results 
  will 
  be 
  attained 
  than 
  it 
  is 
  otherwise 
  possible 
  to 
  

  

  