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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/AP/16/25/2" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Unpublished letter, regarding the north magnetic pole from John Macdonald to Davies Gilbert</dc:title>
  <dc:description>Macdonald writes on calculations regarding magnetic dip which he believes will help to find the depth of the north magnetic pole within the Earth. Includes onediagram showing an experimental mode of finding the depth of the magnetic pole.

Subject: Magnetism / Trigonometry

Written by Macdonald at Summerlands, Exeter [England].</dc:description>
  <dc:date>5 February 1831</dc:date>
</rdf:Description>