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    Black Framed Canvas

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    Medal commemorating Pierre Janssen and Joseph Norman Lockyer French and English astronomers In working independently of each other on spectroscopic studies of solar prominences Pierre Jules Cesar Janssen and Joseph Norman Lockyer both observed a yellow line in the solar spectrum Lockyer named it Helium from helios sun Reverse of a commemorative medal showing Phaeton driving his father Apollos chariot near the sun

    Medal Commemorating Pierre Janssen and Norman Lockyer, French and English Astronomers, 1868-null-Framed Stretched Canvas