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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/RBO/21/64" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>'The Description and Use of an Apparatus added as an Improvement to Davis's Quadrant, consisting of a Mercurial level...' by Charles Leigh</dc:title>
  <dc:description>'... for taking the Co-altitude of the Sun or Star at Sea, without the usual assistance of the sensible Horizon, which frequently is obscured'
Engraved figure from 'Philosophical Transactions' attached
Read to the Royal Society on 28 June 1739</dc:description>
  <dc:date>1739</dc:date>
</rdf:Description>