﻿1875.] 
  

  

  Observations 
  made 
  in 
  Little 
  Namaqualand. 
  

  

  559 
  

  

  Vibrations. 
  

  

  Three 
  sets 
  were 
  taken 
  ; 
  the 
  first 
  two 
  were 
  observed 
  at 
  unequal 
  intervals, 
  

   and 
  were 
  made 
  somewhat 
  under 
  difficulties. 
  Some 
  ostriches 
  bore 
  down 
  

   upon 
  the 
  instrument 
  and 
  had 
  to 
  be 
  continually 
  driven 
  from 
  it. 
  The 
  

   mean 
  of 
  the 
  first 
  two 
  sets, 
  however, 
  agrees 
  very 
  closely 
  with 
  the 
  third. 
  

  

  From 
  the 
  first 
  two 
  sets 
  r=5 
  s 
  -0608. 
  

  

  The 
  last 
  set 
  gave 
  : 
  — 
  

  

  1874, 
  April 
  15, 
  ll 
  b 
  6 
  m 
  . 
  Temperature 
  80°-2. 
  90p=3' 
  53". 
  r^o^OGOO, 
  

   r 
  2 
  =5 
  s 
  -0603, 
  or 
  r=5 
  s 
  -0602. 
  

  

  The 
  value 
  r=5 
  s, 
  0606 
  has 
  been 
  adopted. 
  

  

  Deflections. 
  

  

  April 
  15, 
  3 
  h 
  . 
  Temperature 
  

  

  Distance 
  1*0 
  foot' 
  

  

  10 
  48 
  35 
  

  

  10 
  52 
  27 
  

  

  10 
  55 
  28 
  

  

  .10 
  54 
  40 
  

  

  >u=10° 
  52' 
  48' 
  

  

  Hence 
  for 
  the 
  Klipfontein 
  station 
  we 
  have 
  : 
  — 
  

  

  Variation 
  V= 
  28° 
  23' 
  21" 
  

  

  Horizontal 
  force 
  .... 
  X= 
  4*4343 
  

  

  Magnetic 
  moment 
  . 
  . 
  m 
  — 
  0*4279 
  

  

  Dip 
  D= 
  53° 
  21' 
  56" 
  

  

  Total 
  force 
  F= 
  7*4312 
  

  

  The 
  total 
  eclipse 
  of 
  the 
  sun 
  was 
  observed 
  from 
  this 
  station 
  on 
  April 
  1G. 
  

   The 
  sky 
  was 
  perfectly 
  clear 
  from 
  clouds 
  during 
  the 
  whole 
  da} 
  r 
  . 
  

  

  Ookiep 
  Station. 
  

  

  Approximate 
  longitude 
  l 
  h 
  ll 
  m 
  33 
  s 
  

  

  Approximate 
  south 
  latitude 
  29° 
  36' 
  15" 
  

  

  This 
  station 
  was 
  3059 
  feet 
  above 
  the 
  level 
  of 
  the 
  sea. 
  This 
  height 
  is 
  

   derived 
  from 
  Mr. 
  Hall's 
  levelling. 
  The 
  instruments 
  were 
  placed 
  as 
  near 
  

   Mr. 
  Carson's 
  house 
  as 
  would 
  insure 
  freedom 
  from 
  any 
  disturbing 
  effect 
  of 
  

   the 
  iron 
  about 
  the 
  house. 
  Ookiep 
  is 
  surrounded 
  by 
  mountains, 
  which 
  

   impeded 
  very 
  early 
  or 
  late 
  observations 
  of 
  the 
  sun 
  from 
  the 
  station 
  

   chosen. 
  It 
  is 
  the 
  chief 
  mining 
  station, 
  at 
  present, 
  of 
  the 
  Cape 
  Copper- 
  

   Mining 
  Company. 
  

  

  Dip 
  Observations. 
  

  

  1874, 
  April 
  18, 
  ll 
  h 
  . 
  A, 
  South 
  53 
  9 
  58 
  

  

  A 
  2 
  North 
  53 
  34 
  44 
  

  

  Dip 
  = 
  53 
  22 
  21 
  

  

  YOL. 
  XXIII. 
  2 
  IT 
  

  

  