<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/AP/2/4a/6" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Unpublished diagram, 'Du levier de la troisième espèce' ['On the third type of lever'] by unknown artist</dc:title>
  <dc:description>Diagram of Fraenkel's 'third type' of lever, with two counterweights. Includes explanation of the figure in both German and French.

Subject: Mathematics</dc:description>
  <dc:date>[1828]</dc:date>
</rdf:Description>