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Voyages in the Southern Hemisphere, Vol. IVoyaging Accounts
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Table of the Variation of the Compass


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A Table of the Variation of the Compass, as observed on board of the SWALLOW.

N.B. The days of the month in this Table, are not by the Nautical Account, as is the custom; but, for the convenience of those that are not used to that way of reckoning, are reduced to the Civil Account: A.M. denotes, that the observation was made in the forenoon, and P.M. in the afternoon, of that day on the noon of which the latitude and longitude of the ship were taken.

TIME. Latitude in at Noon. Longitude in at Noon from London. Variation. REMARKS.
  North. West. West.  
1766. August   English Channel 22° 30  
  30. P.M. 45° 22 13° 17 20 25 From the Downs to the Island of Madeira
Septem. 3. P.M. 38 36 13 40 19 04  
  4. A.M. 37 27 14 12 20 17  
Island Madeira -- -- 32 34 16 35 16 00  
  17. A.M. 24 33 19 22 13 00  
  21. A.M. 17 19 22 19 11 14 The island of Sall, in sight, S. by W. ten leagues.
  22. P.M. 16 34 22 29 8 20 Was then between the Island of Sall and the Island of May.
Porto Praya -- -- 15 00 23 00 8 00 Island of Saint Jago.
October 10. P.M. 6 34 21 41 5 36  
  11. P.M. 6 40 21 35 6 00  
      South.      
  22. A.M. 0 06 25 03 6 23  
            On the passage from the island of Saint Jago to the Streights of Magellan.
  25. P.M. 4 14 27 23 4 30  
  27. A.M. 7 03 28 49 3 32  
  28. P.M. 8 46 29 14 1 50  
  30. P.M. 10 57 30 09 0 30  
  31. A.M. 12 30 30 30 No Var.  


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© Derived from Volume I of the London 1773 Edition: National Library of Australia call no. FERG 7243, page 669, 2004
Published by South Seas, using the Web Academic Resource Publisher
To cite this page use: http://nla.gov.au/nla.cs-ss-jrnl-hv01-669