﻿OF 
  THE 
  HORIZONTAL 
  NEEDLE. 
  9 
  

  

  The 
  meteorological 
  phenomena 
  of 
  this 
  day 
  were 
  particularly 
  inter- 
  

   esting, 
  and 
  will 
  be 
  referred 
  to 
  in 
  detail 
  : 
  the 
  curves 
  of 
  observations 
  

   are 
  on 
  No. 
  3, 
  Plate 
  I.* 
  The 
  variation 
  evidently 
  diminishing 
  at 
  mid- 
  

   night, 
  and 
  the 
  sky 
  being 
  clear, 
  the 
  observations 
  were 
  intermitted 
  until 
  

   8 
  A.M. 
  Great 
  pains 
  were 
  bestowed 
  in 
  noting 
  the 
  fluctuations 
  before, 
  

   during, 
  and 
  after 
  the 
  shower 
  and 
  the 
  gust 
  in 
  the 
  afternoon 
  ; 
  the 
  

   periods 
  of 
  change 
  being 
  seized 
  for 
  observation. 
  

  

  TABLE 
  IV. 
  

  

  Hour. 
  

  

  N. 
  Pole 
  W. 
  

  

  Temp. 
  

  

  Remarks. 
  

  

  Hour. 
  

  

  N. 
  Pole 
  W. 
  

  

  Temp. 
  

  

  Remarks. 
  

  

  

  Deg 
  

  

  . 
  Min. 
  

  

  Deg. 
  

  

  Cept. 
  1. 
  

   C 
  Clear. 
  Therm. 
  

  

  12 
  m. 
  

  

  Deg. 
  Min. 
  

   3 
  34.9 
  

  

  Deg. 
  

   58 
  

  

  C 
  Sept. 
  2. 
  

  

  £ 
  Cloudless 
  night. 
  

  

  124 
  P.M. 
  

  

  3 
  

  

  21.0 
  

  

  674 
  

  

  < 
  on 
  the 
  platform 
  

   { 
  with 
  needle. 
  

  

  124 
  A.M. 
  

  

  

  

  Cloudless. 
  

  

  1 
  P.M. 
  

  

  

  

  

  

  1 
  A.M. 
  

  

  3 
  33.2 
  

  

  58 
  

  

  Cloudless. 
  

  

  n 
  p.m. 
  

  

  3 
  

  

  21.9 
  

  

  63 
  

  

  Clear. 
  

  

  14 
  A.M. 
  

  

  

  

  

  2 
  P.M. 
  

  

  

  

  

  

  2 
  A.M. 
  

  

  3 
  32.0 
  

  

  56 
  

  

  Cloudless. 
  

  

  2| 
  P.M. 
  

  

  3 
  

  

  21.4 
  

  

  70 
  

  

  Stratus 
  to 
  west. 
  

  

  24 
  A.M. 
  

  

  

  

  

  3 
  P.M. 
  

  

  3 
  

  

  22.2 
  

  

  6S# 
  

  

  Clear. 
  

  

  3 
  A.M. 
  

  

  3 
  32.0 
  

  

  48 
  

  

  Cloudless. 
  

  

  4 
  P.M. 
  

  

  

  

  

  

  4 
  A.M. 
  

  

  3 
  32.0 
  

  

  47 
  

  

  Cloudless. 
  

  

  5 
  P.M. 
  

  

  O 
  

  

  O 
  

  

  22.6 
  

  

  

  Clear. 
  

  

  5 
  A.M. 
  

  

  3 
  31.7 
  

  

  464 
  

  

  Cloudless. 
  

  

  51 
  P.M. 
  

  

  

  

  

  

  54 
  A.M. 
  

  

  3 
  32.0 
  

  

  44 
  

  

  Cloudless. 
  

  

  6 
  P.M. 
  

  

  3 
  

  

  15.1 
  

  

  69 
  

  

  Clear. 
  

  

  6 
  A.M. 
  

  

  3 
  30.8 
  

  

  47 
  

  

  Clear. 
  

  

  61 
  P.M. 
  

  

  

  

  

  Sun 
  sets. 
  

  

  64 
  A.M. 
  

  

  3 
  21.9 
  

  

  48 
  

  

  Clear. 
  

  

  7 
  P.M. 
  

  

  3 
  

  

  14.7 
  

  

  67i 
  

  

  Cloudless. 
  

  

  7 
  A.M. 
  

  

  

  

  

  74 
  P.M. 
  

  

  

  

  

  

  74 
  A.M. 
  

  

  3 
  19.1 
  

  

  58 
  

  

  Clear. 
  

  

  8 
  P.M. 
  

  

  3 
  

  

  16.0 
  

  

  624 
  

  

  C 
  Cloudless. 
  Moon 
  

   I 
  in 
  first 
  quarter. 
  

  

  8 
  A.M. 
  

  

  3 
  12.6 
  

  

  61 
  

  

  Clear. 
  

  

  8£ 
  P.M. 
  

  

  

  

  

  

  8| 
  A.M. 
  

  

  3 
  10.6 
  

  

  64 
  

  

  Clear. 
  

  

  9 
  P.M. 
  

  

  3 
  

  

  28.5 
  

  

  

  Cloudless. 
  

  

  9 
  A.M. 
  

  

  3 
  12.6 
  

  

  66 
  

  

  Clear. 
  

  

  10 
  P.M. 
  

  

  3 
  

  

  28.9 
  

  

  60 
  

  

  Cloudless. 
  

  

  10 
  A.M. 
  

  

  3 
  13.5 
  

  

  72 
  

  

  Clear. 
  

  

  11 
  P.M. 
  

  

  3 
  

  

  34.9 
  

  

  59| 
  

  

  CMoon 
  sets. 
  

  

  1 
  Cloudless 
  night. 
  

  

  11 
  A.M. 
  

   114 
  A.M. 
  

  

  3 
  15.1 
  

   3 
  12.7 
  

  

  76 
  

   76 
  

  

  Clear. 
  

   Clear. 
  

  

  

  

  

  

  

  

  

  

  

  The 
  weather 
  of 
  the 
  first 
  part 
  of 
  this 
  twenty-four 
  hours 
  was 
  slightly 
  

   affected 
  by 
  the 
  storm 
  of 
  the 
  day 
  before 
  ; 
  there 
  was 
  a 
  stratus 
  to 
  the 
  west 
  

   at 
  2^ 
  in 
  the 
  afternoon, 
  which, 
  when 
  it 
  disappeared, 
  left 
  a 
  cloudless 
  

   day, 
  succeeded 
  by 
  a 
  perfectly 
  clear 
  and 
  still 
  night. 
  The 
  thermometer 
  

   was, 
  throughout 
  the 
  observations, 
  placed 
  in 
  the 
  inclosure 
  containing 
  

   vol. 
  v. 
  — 
  c 
  

  

  