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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/LBO/4/23" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Copy extract from a letter by  Francis Slusius, Leodii, to Henry Oldenburg</dc:title>
  <dc:description>Being an extract ' Containing some observations of his upon Dr Barrow's Praefectiones Geometricae .'

Includes a pen and ink geometric drawing in the margin on p 43</dc:description>
  <dc:date>25 July 1670</dc:date>
</rdf:Description>