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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/17/211" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Letter, from G. Wharton Simpson to Sir John Herschel, dated at Canonbury</dc:title>
  <dc:description>Autograph letter signed by sender. Thanks John Frederick William Herschel for helping to clarify origins of Louis Daguerre's use of hyposulfite of soda for fixing photographs. Provides further information on photography, particular solar microscope photography.</dc:description>
  <dc:date>14 May 1866</dc:date>
</rdf:Description>