<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/AP/39/20/3" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Photograph, train signalling system by unknown photographer</dc:title>
  <dc:description>A photograph, labelled figure 3, showing Walker's bell sytem for train signalling.

Subject: Engineering</dc:description>
  <dc:date>1857</dc:date>
</rdf:Description>