<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/20/200" 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 William Ritchie</dc:title>
  <dc:description>Copy of a letter. Will present alterations of William Ritchie's paper to Royal Society [of London] [see John Frederick William Herschel's 1825-1-27]. Asks if he may describe the similarities between William Ritchie's photometer and an instrument John Fred</dc:description>
  <dc:date>19 February 1825</dc:date>
</rdf:Description>