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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/14/349" 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 Ritchie to Sir John Herschel, dated at Tain</dc:title>
  <dc:description>Autograph letter signed by sender. Pleased John Frederick William Herschel liked his paper on differential photometer. Discusses apparatus for experiments on light. Describes some papers he has written and some he is writing.</dc:description>
  <dc:date>3 March 1825</dc:date>
</rdf:Description>