Pierre Janssen
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Pierre Jules César Janssen, 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, and with some justification the element helium.
Photo taken by Janssen, from the Meudon observatory, of Renard and Krebs' La France dirigible (1885)
Janssen's grave in Paris
Norman Lockyer
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Sir Joseph Norman Lockyer was an English scientist and astronomer. Along with the French scientist Pierre Janssen, he is credited with discovering the gas helium. Lockyer also is remembered for being the founder and first editor of the influential journal Nature.
Sir Joseph Norman Lockyer, c. 1897
This building on Sheep Street, Rugby was Lockyer's birthplace, as is declared by a blue plaque
The Norman Lockyer Observatory
English Heritage plaque in Penywern Road, Earls Court, London.