<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/NLB/41/277" 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 Robert William Frederick Harrison, to E W Wallis, Royal Sanitary Institute, 90 Buckingham Palace Road, S.W.</dc:title>
  <dc:description>The apparatus to which Wallis refers in his letter of 10 November intended for the estimation of dust particles in air, was exhibited by Dr John Aitken. It is believed that the apparatus was made by the Cambridge Scientific Instrument Company.</dc:description>
  <dc:date>12 November 1909</dc:date>
</rdf:Description>