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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/17/287" 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 William Henry Fox Talbot to Sir John Herschel, dated at 44 Queen Anne St.</dc:title>
  <dc:description>Autograph letter signed by sender. Enlarges upon his method of using salt as photographic fixer; then asks John Frederick William Herschel to explain the chemistry thereof. Has tried Louis Daguerre's fixing process without success.</dc:description>
  <dc:date>1 March 1839</dc:date>
</rdf:Description>