Wikipedia entry
Introduction
Pierre Jules César Janssen (22 February 1824 – 23 December 1907), usually known as Jules Janssen, was a French astronomer who, along with English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, but there is no justification for the conclusion that he deserves credit for the co-discovery of the element helium.
Wikidata
Q298581
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Works

31 works online

Exhibitions

Publications

  • Photography at MoMA: 1840–1920 Hardcover, 376 pages
  • The Shape of Things: Photographs from Robert B. Menschel Exhibition catalogue, Hardcover, 152 pages
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