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Pierre Janssen and Joseph Norman Lockyer, French and English astronomers, 1868. Artist: Unknown

Pierre Janssen and Joseph Norman Lockyer, French and English astronomers, 1868. Pierre Jules Cesar Janssen (1824-1907), left, and Joseph Norman Lockyer (1836-1920). In 1868 while making spectroscopic studies of solar prominences, working independently, both men observed a yellow line in the solar spectrum. Lockyer named it Helium from helios (sun). Obverse of a commemorative medal.
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Titre:
Pierre Janssen and Joseph Norman Lockyer, French and English astronomers, 1868. Artist: Unknown
Légende: Voir la traduction automatique
Pierre Janssen and Joseph Norman Lockyer, French and English astronomers, 1868. Pierre Jules Cesar Janssen (1824-1907), left, and Joseph Norman Lockyer (1836-1920). In 1868 while making spectroscopic studies of solar prominences, working independently, both men observed a yellow line in the solar spectrum. Lockyer named it Helium from helios (sun). Obverse of a commemorative medal.
Crédit:
Album / Oxford Science Archive / Heritage Images
Autorisations:
Modèle: Non - Propriété: Non
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Taille de l'image:
4204 x 4154 px | 50.0 MB
Taille d'impression:
35.6 x 35.2 cm | 14.0 x 13.8 in (300 dpi)
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