<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/EL/P1/5" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Copy of a letter, from Pierre Petit to Henry Oldenburg</dc:title>
  <dc:description>Original letter dated 5 April 1667

Concerning theories on the subject of the variation of magnetic declination (see EL/P1/6); concerning Petit's paper on the latitude at Paris and magnet declination printed in 1660; can send a paper on the properties of lodestones

Read at the Royal Society on 30 May 1667</dc:description>
  <dc:date>1667</dc:date>
</rdf:Description>