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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/17/405a" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Copy letter, from Sir John Herschel to John Tyndall, dated at Collingwood</dc:title>
  <dc:description>Contemporary copy of the letter. Thinks John Tyndall's work on polarization will lead to remarkable discovery. Discusses production of rainbow, parallels to Isaac Newton's explanation of black spot on a soap bubble, and problems in John Tyndall's undulatory theory explanation of reflection. In John Tyndall's experiments, what are nebulous particles produced by light in gas or vapor?</dc:description>
  <dc:date>2 December 1868</dc:date>
</rdf:Description>