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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/4/272" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Draft letter, from Sir John Herschel to David Brewster</dc:title>
  <dc:description>Draft letter. Sends an abstract of his paper on observations relating to the practical construction of telescopes [John Frederick William Herschel's 'Practical Rules,' 1822]. Would like 25 copies for distribution. His recent experiments with polarized light.</dc:description>
  <dc:date>1823</dc:date>
</rdf:Description>