<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/HS/25/14/15" 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 Robert Hunt</dc:title>
  <dc:description>Copy of a letter. Is anxious for some means to be developed to get a measurable quantity [preferably by weight] from the action of a beam of light on a surface. John Frederick William Herschel has been experimenting in photography with 'flouric' compounds.</dc:description>
  <dc:date>1842-12-9 or later</dc:date>
</rdf:Description>