﻿14 
  

  

  ON 
  THE 
  DIURNAL 
  VARIATION 
  

  

  TABLE 
  IX. 
  

  

  Hour. 
  

  

  N. 
  

  

  Pole 
  W. 
  

  

  Temp. 
  

  

  Remarks. 
  

  

  Hour. 
  

  

  N. 
  Pole 
  W. 
  

  

  Temp. 
  

  

  Remarks. 
  

  

  12 
  M. 
  

  

  Deg. 
  Min. 
  

   3 
  22.2 
  

  

  Deg. 
  

   64 
  

  

  C 
  Sept. 
  6. 
  

  

  < 
  Stratus. 
  Cumu- 
  

  

  12 
  m. 
  

  

  Deg. 
  Min. 
  

   3 
  26.6 
  

  

  Deg. 
  

   54 
  

  

  Sept. 
  7. 
  

  

  

  

  

  

  ( 
  lus. 
  Wind 
  W. 
  

  

  

  

  

  

  1 
  P.M. 
  

  

  3 
  

  

  22.6 
  

  

  65 
  

  

  

  1 
  A.M. 
  

  

  3 
  26.2 
  

  

  53 
  

  

  

  2 
  P.M. 
  

  

  3 
  

  

  22.6 
  

  

  66 
  

  

  

  

  

  

  

  3 
  P.M. 
  

  

  3 
  

  

  22.6 
  

  

  67 
  

  

  

  

  

  

  

  4 
  P.M. 
  

  

  3 
  

  

  22.6 
  

  

  

  <J 
  Dark 
  cumulo- 
  

   ~l 
  stratus 
  to 
  W. 
  

  

  

  

  

  C 
  Low 
  stratus 
  driv- 
  

  

  5J 
  P.M. 
  

  

  3 
  

  

  21.0 
  

  

  67 
  

  

  5i 
  A.M. 
  

  

  3 
  24.1 
  

  

  54 
  

  

  < 
  ing 
  fr. 
  E. 
  High 
  

   ( 
  cumulus 
  fr.S.W. 
  

  

  6 
  P.M. 
  

  

  3 
  

  

  21.4 
  

  

  64§ 
  

  

  Cirrus. 
  

  

  

  

  

  

  6h 
  P.M. 
  

  

  3 
  

  

  23.0 
  

  

  62| 
  

  

  cDew 
  deposited 
  at 
  

   l 
  sunset. 
  

  

  

  

  

  

  71 
  P.M. 
  

  

  3 
  

  

  23.0 
  

  

  58 
  

  

  C 
  Cirrus. 
  Rare 
  Cu- 
  

   l 
  mulus. 
  

  

  

  

  

  

  S 
  P.M. 
  

  

  

  

  

  

  8 
  A.M. 
  

  

  3 
  22.2 
  

  

  60 
  

  

  Dense 
  fog. 
  

  

  9 
  P.M. 
  

  

  3 
  

  

  26.6 
  

  

  54 
  

  

  Cloudless. 
  

  

  9 
  A.M. 
  

  

  3 
  23.3 
  

  

  64 
  

  

  C 
  Fog 
  has 
  disap- 
  

  

  £ 
  peared. 
  

  

  ( 
  Clear. 
  Cumulus 
  

  

  < 
  sometimes 
  over 
  

  

  ^ 
  sun. 
  

  

  'Roof 
  removed, 
  

  

  n 
  p.m. 
  

  

  

  

  

  

  H 
  A.M. 
  

  

  3 
  23.5 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  variation 
  dimin- 
  

  

  9| 
  P.M. 
  

  

  

  

  

  

  H 
  A.M. 
  

  

  2 
  57.8 
  

  

  

  ished 
  rapidly, 
  

   i 
  and 
  at 
  9i 
  had 
  

  

  increased 
  again 
  

   L 
  to 
  2 
  57.8. 
  

  

  10 
  P.M. 
  

  

  3 
  

  

  26.6 
  

  

  54 
  

  

  

  10 
  A.M. 
  

  

  2 
  58.2 
  

  

  66j 
  

  

  

  11 
  P.M. 
  

  

  3 
  

  

  26.6 
  

  

  52 
  

  

  Very 
  slight 
  haze. 
  

   C 
  Cumulo-stratusto 
  

  

  11 
  A.M. 
  

  

  3 
  16.0 
  

  

  67 
  

  

  

  12 
  m. 
  

  

  3 
  

  

  26.6 
  

  

  54 
  

  

  < 
  W. 
  Wind 
  draw- 
  

   l 
  ing 
  to 
  S. 
  of 
  W. 
  

  

  12 
  M. 
  

  

  3 
  33.2 
  

  

  69 
  

  

  Vibrating. 
  

  

  On 
  the 
  removal 
  of 
  the 
  covering 
  from 
  the 
  needle, 
  much 
  water 
  was 
  

   evaporated 
  from 
  the 
  bottom 
  and 
  sides 
  of 
  the 
  box, 
  collecting 
  in 
  drops 
  on 
  

   the 
  glass 
  at 
  the 
  N. 
  and 
  S. 
  ends 
  of 
  the 
  box; 
  this 
  was 
  wiped 
  off 
  as 
  it 
  

   collected, 
  by 
  removing 
  the 
  glass. 
  The 
  sudden 
  diminution 
  of 
  variation, 
  

   and 
  its 
  rapid 
  increase, 
  are 
  points 
  worthy 
  of 
  remark. 
  

  

  The 
  remaining 
  observations 
  were 
  made 
  with 
  the 
  sun 
  upon 
  the 
  

   needle, 
  a 
  thermometer 
  being 
  inclosed 
  in 
  the 
  box 
  so 
  as 
  to 
  have, 
  hourly, 
  

   the 
  temperature 
  of 
  the 
  needle. 
  A 
  day 
  intervened 
  between 
  the 
  last 
  

   observations 
  and 
  those 
  in 
  the 
  table 
  which 
  follows 
  ; 
  during 
  that 
  day 
  the 
  

  

  