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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/AP/13/14/3" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Unpublished diagram, ship direction and variation of compass by John Macdonald</dc:title>
  <dc:description>Diagram showing the impact of the direction of a ship's head with respect to the magnetic meridian on the variation of the compass.

Subject: Geodesy

Written by Macdonald in Summerlands, Exeter [Devon, England].</dc:description>
  <dc:date>12 January 1829</dc:date>
</rdf:Description>