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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/AP/56/5/4" 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Unpublished diagram, 'Diagram showing how, when the eyeball simply rotates, the successive positions of the visual line converge to a common centre' by John Lucas Tupper</dc:title>
  <dc:description>A diagram in black ink showing a rectangular surface with 'a perforated septum' at one edge. Lines radiate from the septum, with two arcs marked on the rectangular surface with pins. A note states 'The pins are much nearer to the eye than in the experiment.'

Subject: Optics</dc:description>
  <dc:date>1874</dc:date>
</rdf:Description>