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0510010683

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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0510010683.jpg
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World History Archive
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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.