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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/AP/16/25" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Unpublished letters, regarding the north magnetic pole from John Macdonald to Davies Gilbert</dc:title>
  <dc:description>Correspondence regarding Macdonald's research into the depth of the  north magnetic pole. Includes two letters from Macdonald to Gilbert, dated 19 January 1831 (featuring a copy of a letter from Macdonald to James R Graham Bart), and 5 February 1831. Letter dated 5 February 1831 includes one diagram regarding an experimental method for finding the depth of the north magnetic pole.

Subject: Magnetism / Trigonometry</dc:description>
  <dc:date>19 January 1831-5 February 1831</dc:date>
</rdf:Description>