Sujet
Pierre Janssen and Joseph Norman Lockyer, French and English astronomers, 1868. Artist: Unknown
Légende
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.
Oxford Science Archive
Date
1868
Crédit
Photo12/Heritage Images
Notre référence
HRM19B66_319
Model release
Non
Licence
Droits gérés
Format disponible
50,0Mo (2,1Mo) / 35,6cm x 35,2cm / 4204 x 4154 (300dpi)