<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/MS/743/1/128" 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 William Henry Dallinger, Ingleside, Lee, to [John Hall] Gladstone</dc:title>
  <dc:description>He is testing the qualities of a new object-glass. Wishes to consult Gladstone on mounting materials and which are of most optical value. Requests that Gladstone provide him with refractive indices of seven named materials.</dc:description>
  <dc:date>30 June 1891</dc:date>
</rdf:Description>