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<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/MS/929/1/233" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Letter from Francis H. Williams, 505 Beacon Street, Boston, to James Mackenzie Davidson</dc:title>
  <dc:description>Writes of a tube which Dr. W. D. Coolidge has designed. Explains that it can be adjusted to any degree of hardness in a few seconds and can carry almost any amount of current. </dc:description>
  <dc:date>20 March 1914</dc:date>
</rdf:Description>