﻿384 
  

  

  Mr. 
  W. 
  H. 
  Cripps 
  on 
  a 
  

  

  [Apr. 
  29, 
  

  

  atmosphere 
  or 
  envelope. 
  Notwithstanding 
  the 
  somewhat 
  conflicting 
  

   statements 
  which 
  have 
  appeared 
  since 
  writing 
  my 
  Note 
  No. 
  L, 
  as 
  to 
  

   the 
  phenomena 
  seen 
  at 
  certain 
  stations, 
  and 
  pending 
  the 
  authoritative 
  

   decisions 
  which 
  may 
  hereafter 
  be 
  pronounced, 
  it 
  appears 
  to 
  me 
  probable 
  

   that 
  height 
  of 
  station, 
  inferiority 
  of 
  instruments, 
  insensibility 
  of 
  eye 
  

   to 
  faint 
  lights 
  and 
  shadows, 
  and 
  other 
  causes, 
  are 
  likely 
  to 
  conspire 
  

   towards 
  producing 
  a 
  ligament 
  (or 
  pear-drop) 
  at 
  the 
  internal 
  contacts, 
  

   provided 
  there 
  is 
  an 
  atmosphere 
  or 
  envelope 
  around 
  the 
  planet 
  to 
  afford 
  

   a 
  first 
  cause. 
  

   Dehra 
  Doon, 
  

  

  17th 
  December, 
  1874. 
  - 
  » 
  

  

  II. 
  " 
  On 
  a 
  Continuous 
  Self 
  -registering 
  Thermometer." 
  By 
  

   W. 
  Harrison 
  Cripps. 
  Communicated 
  by 
  Prof. 
  Stokes, 
  

   Sec.E.S. 
  Received 
  March 
  17, 
  1875. 
  

  

  The 
  object 
  of 
  this 
  paper 
  is 
  to 
  explain 
  the 
  working 
  of 
  a 
  continuous 
  self- 
  

   registering 
  thermometer, 
  the 
  detail 
  of 
  which 
  I 
  have 
  been 
  for 
  some 
  years 
  

   endeavouring 
  to 
  perfect, 
  though 
  it 
  is 
  only 
  recently 
  that 
  I 
  have 
  brought 
  

   my 
  instrument 
  to 
  the 
  perfection 
  necessary 
  for 
  practical 
  demonstration. 
  

  

  I 
  am 
  aware 
  of 
  many 
  imperfections 
  in 
  the 
  instrument, 
  but 
  trust 
  that 
  

   these 
  will 
  be 
  remedied 
  after 
  some 
  further 
  experiments. 
  The 
  object 
  of 
  

   my 
  invention 
  is 
  to 
  produce 
  a 
  thermometer 
  that 
  shall 
  not 
  only 
  register 
  

   the 
  highest 
  and 
  lowest 
  temperature 
  occurring 
  in 
  a 
  given 
  time, 
  but 
  shall 
  

   also, 
  by 
  a 
  pencil 
  indicator, 
  mark 
  automatically 
  every 
  minute 
  variation 
  

   occurring 
  during 
  the 
  time 
  the 
  instrument 
  is 
  at 
  work. 
  

  

  This 
  thermometer 
  will, 
  I 
  hope, 
  be 
  of 
  value 
  for 
  meteorological 
  observa- 
  

   tions 
  ; 
  for 
  it 
  will 
  show 
  the 
  exact 
  variations 
  taking 
  place 
  from 
  minute 
  to 
  

   minute 
  during 
  day 
  and 
  night, 
  and 
  by 
  this 
  means 
  determine 
  the 
  exact 
  

   amount 
  of 
  alterations 
  in 
  temperature 
  occurring 
  simultaneously 
  at 
  various 
  

   places 
  during 
  different 
  periods 
  of 
  the 
  month 
  or 
  year, 
  without 
  the 
  trouble 
  

   of 
  photographic 
  registration. 
  

  

  By 
  a 
  simple 
  modification 
  of 
  my 
  instrument, 
  I 
  believe 
  that 
  I 
  shall 
  be 
  

   able 
  to 
  produce 
  a 
  thermometer 
  of 
  such 
  form 
  and 
  size 
  as 
  shall 
  enable 
  the 
  

   physician 
  or 
  physiologist 
  to 
  learn 
  with 
  accuracy 
  the 
  exact 
  hour 
  and 
  

   minute 
  when 
  any 
  alteration 
  of 
  temperature 
  in 
  the 
  human 
  body 
  takes 
  

   place, 
  and 
  automatically 
  to 
  register 
  these 
  variations. 
  

  

  As 
  regards 
  the 
  barometer, 
  many 
  beautiful 
  self 
  -registering 
  instruments 
  

   are 
  in 
  use 
  ; 
  for 
  the 
  lower 
  surface 
  of 
  the 
  mercurial 
  column 
  being 
  exposed, 
  

   offers 
  an 
  easy 
  method 
  of 
  producing 
  a 
  motive 
  force. 
  In 
  the 
  thermometer 
  

   the 
  case 
  is 
  different, 
  for 
  no 
  means 
  of 
  communication 
  exist 
  between 
  the 
  

   registering 
  machinery 
  and 
  the 
  mercury 
  in 
  its 
  hermetically 
  sealed 
  tube. 
  

   So 
  far 
  as 
  I 
  know, 
  the 
  only 
  instrument 
  of 
  this 
  kind 
  ever 
  suggested 
  is 
  the 
  

   one 
  by 
  Merey 
  ; 
  but 
  from 
  the 
  fact 
  that 
  air 
  is 
  the 
  motive 
  force 
  used 
  by 
  

  

  