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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/14/111" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Incomplete letter, from Charles Pritchard to Sir John Herschel</dc:title>
  <dc:description>Autographed letter, incomplete. Experiments with lens curvature and prisms. Wants to discover set rules for lens thickness-to-curvature ratio.</dc:description>
  <dc:date>undated</dc:date>
</rdf:Description>