<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/17/425a" 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 Peter Guthrie Tait, dated at Collingwood</dc:title>
  <dc:description>Contemporary copy in sender's hand, signed by sender. Thanks PT for papers on energy. Discusses topics of the papers, including quaternions and the concept of heat equalling motion.</dc:description>
  <dc:date>1864-12</dc:date>
</rdf:Description>