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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/AP/13/14" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Unpublished paper, regarding the action of iron on the magnetic needle by John Macdonald</dc:title>
  <dc:description>Macdonald recounts the polarised effect of guns and iron on the magnetic needle in the binnacle on a ship's deck. He provides guidance for navigation at sea with the effect of these iron objects in mind. Includes one set of illustrations in the text and three separate pages of illustrations.

Subject: Geodesy

Written by Macdonald in Summerlands, Exeter [Devon, England].</dc:description>
  <dc:date>12 January 1829</dc:date>
</rdf:Description>