﻿Special 
  Report 
  No. 
  7 
  

  

  THE 
  ESTABLISHMENT 
  OF 
  MERIDIAN 
  LINES 
  

  

  BY 
  

  

  G. 
  D. 
  Harris 
  

  

  CONTENTS 
  

   Preliminary 
  Remarks 
  

   The 
  Compass 
  Needi^e 
  

  

  Variatio7is 
  and 
  imperfections 
  . 
  .312 
  

  

  The 
  Transit, 
  with 
  and 
  without 
  Solar 
  Attachment 
  

   Its 
  use 
  312 
  Cost 
  .313 
  

  

  Improvement 
  of 
  Compass 
  Surveying 
  

  

  Magnetic 
  declination 
  and 
  Need 
  of 
  meridian 
  lines 
  314 
  

  

  its 
  secular 
  change 
  313 
  How 
  established 
  .......314 
  

  

  Our 
  Outfit 
  and 
  Experiences 
  

   Meridian 
  Lines 
  Established 
  

  

  Mansfield 
  317 
  Harrison 
  biifg 
  ; 
  . 
  320 
  

  

  Many 
  317 
  Shreveport 
  320 
  

  

  Natchitoches 
  317 
  Motiroe 
  321 
  

  

  Colfax 
  318 
  Alexandria 
  322 
  

  

  Winnfield 
  318 
  Floyd 
  322 
  

  

  Columbia 
  -319 
  

  

  Magnetic 
  Declination 
  

  

  Amount 
  of 
  " 
  variation 
  " 
  determined 
  by 
  o?ie 
  com- 
  

   pass 
  not 
  applicable 
  to 
  work 
  done 
  with 
  another 
  . 
  .322 
  

   A 
  fine 
  f 
  eld 
  for 
  magnetic 
  work 
  32 
  3 
  

  

  