﻿556 
  

  

  Mr. 
  E. 
  J. 
  Stone 
  on 
  Magnetical 
  [June 
  17, 
  

  

  that 
  required 
  for 
  the 
  necessary 
  interpolations 
  of 
  the 
  sun's 
  declination. 
  

   I 
  may 
  perhaps 
  be 
  permitted 
  to 
  mention 
  that 
  the 
  observations 
  whose 
  

   results 
  are 
  contained 
  in 
  the 
  present 
  paper 
  could 
  hardly 
  have 
  been 
  made 
  

   had 
  it 
  not 
  been 
  for 
  the 
  assistance 
  afforded 
  me 
  by 
  E. 
  J. 
  Carson, 
  Esq., 
  

   Manager, 
  and 
  E. 
  T. 
  Hall, 
  Esq., 
  C.E., 
  Engineer, 
  of 
  the 
  Cape 
  Copper 
  Com- 
  

   pany. 
  My 
  thanks 
  are 
  clue 
  to 
  them 
  for 
  a 
  thoughtful 
  kindness 
  which 
  

   offered 
  every 
  facility 
  for 
  my 
  work, 
  and 
  yet 
  rendered 
  a 
  working 
  trip 
  into 
  

   a 
  somewhat 
  wild 
  country 
  one 
  of 
  great 
  enjoyment. 
  

  

  Poet 
  Nolloth. 
  

   Station 
  not 
  far 
  from 
  the 
  Cemetery, 
  Sandy 
  Yelt. 
  

   Longitude 
  l 
  h 
  7 
  m 
  28 
  s 
  . 
  South 
  latitude 
  29° 
  15' 
  30". 
  

  

  Dip 
  Observations. 
  Needle 
  A 
  2 
  B, 
  Dover. 
  

   1874, 
  April 
  10, 
  ll 
  h 
  . 
  A 
  2 
  South 
  

  

  A 
  2 
  North 
  53 
  26 
  

  

  53 
  19 
  30 
  

   3 
  

  

  Dip 
  = 
  53 
  22 
  46 
  

  

  The 
  wind 
  was 
  very 
  high 
  at 
  times 
  during 
  these 
  observations 
  ; 
  but 
  the 
  

   results 
  appeared 
  satisfactory. 
  

  

  1874, 
  April 
  11, 
  10 
  h 
  . 
  Temperature 
  61°-2. 
  

   Deflections 
  produced 
  by 
  the 
  vibrating-magnet 
  : 
  — 
  

  

  10 
  56 
  43 
  

  

  1-0 
  foot 
  1 
  

  

  1-3 
  foot 
  

  

  10 
  

   10 
  

   10 
  

  

  £9 
  

  

  w 
  = 
  10° 
  56' 
  41". 
  

  

  4° 
  58' 
  21". 
  

  

  ; 
  5 
  s 
  -05, 
  

  

  o/ 
  

  

  55 
  oz 
  

   57 
  3 
  

   4 
  56 
  3 
  

   4 
  59 
  42 
  

  

  4 
  56 
  33 
  

  

  5 
  17 
  

  

  April 
  11, 
  12 
  h 
  30 
  m 
  . 
  Temperature 
  59°. 
  9 
  0p 
  = 
  2 
  / 
  = 
  torsion. 
  

   r 
  2 
  =5 
  s 
  -05. 
  

  

  Wind 
  so 
  high 
  that 
  the 
  observations 
  had 
  to 
  be 
  abandoned. 
  These 
  

   determinations 
  have 
  not 
  been 
  used. 
  

  

  Variation 
  Observations. 
  

   1874, 
  April 
  12, 
  10\ 
  Temperature 
  75°. 
  90p=2' 
  10". 
  Correction 
  for 
  

   torsion 
  insensible. 
  

  

  Readings 
  for 
  variation-magnet 
  : 
  — 
  , 
  tt 
  

  

  Suspension 
  direct 
  265 
  55 
  30 
  

  

  reversed 
  264 
  40 
  22 
  

  

  Azimuthal 
  reading 
  for 
  magnetical 
  meridian 
  265 
  17 
  56 
  

  

  Azimuthal 
  reading 
  for 
  magnetical 
  meridian 
  with 
  

  

  vibration-magnet. 
  265 
  18 
  5 
  

  

  288 
  8 
  15 
  

  

  northern 
  mark 
  261 
  20 
  35 
  

  

  Eeading 
  for 
  southern 
  mark 
  

  

  