Janssen and Lockyer, 1868. Pierre Jules Cesar Janssen (1824-1907), French astronomer, left, and Joseph Norman Lockyer (1836-1920), English astronomer. 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.

Janssen and Lockyer, 1868. Pierre Jules Cesar Janssen (1824-1907), French astronomer, left, and Joseph Norman Lockyer (1836-1920), English astronomer. 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.
SuperStock offers millions of photos, videos, and stock assets to creatives around the world. This image of Janssen and Lockyer, 1868. Pierre Jules Cesar Janssen (1824-1907), French astronomer, left, and Joseph Norman Lockyer (1836-1920), English astronomer. 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. by World History Archive/Image Asset Management is available for licensing today.
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Image Number: 1746-19633032Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset ManagementContributor:World History ArchiveModel Release:NoProperty Release:NoResolution:4500×4446
1824-1907
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