<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/AP/39/20/4" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Unpublished diagrams, circuit of train signalling system by Charles Walker</dc:title>
  <dc:description>Two circuit diagrams, labelled figures 4-5, showing a schemantic of the train signalling system described by Walker.

Subject: Engineering / Electricity</dc:description>
  <dc:date>9 March 1857</dc:date>
</rdf:Description>