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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/6/184" 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 Augustus De Morgan to Sir John Herschel, dated at 69 Gower St.</dc:title>
  <dc:description>Autograph letter signed by sender. Possible to purchase 12 postage covers for 11d in the Strand. Points out an apparent error in one of John Frederick William Herschel's books on sound. How does an open pipe vibrate? Regarding the private character of J. L. Lagrange.</dc:description>
  <dc:date>5 June 1840</dc:date>
</rdf:Description>