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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/AP/19/15/2" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Unpublished diagram, a luminous point emitting rays by G H S [George Henry Sacheverell] Johnson</dc:title>
  <dc:description>Labelled diagram of a luminous point 'Q' emitting light rays onto a concave reflecting surface, showing the directions in which the rays are reflected.</dc:description>
  <dc:date>1835</dc:date>
</rdf:Description>