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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/MOB/058" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Magnetic surface model by Ferdinand Engel</dc:title>
  <dc:description>Plaster model of a three-dimensional surface intended to represent the seasonal changes of Philadelphia's magnetic fields. Printed inscription on model side: 'Model of the magnetic surface presented in the discussion Part II of the magnetic observations made at the Girard College Philadelphia between 1840 and 1845, by Prof. A.D. Bache. Const. and modeled by Ferdinand Engel, Washington, D.C. 1862.'  The observations which this model records are described in a 36-page pamphlet published by the Smithsonian Institution in 1863. </dc:description>
  <dc:date>1840-1845</dc:date>
</rdf:Description>