Joseph Norman Lockyer (1836-1920) observing the solar spectrum through a multiple-prism spectroscope fitted in a refracting telescope. One of the discoverers of the gas Helium which he named.
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Image Number: 1746-19668408Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:3997×4608
