Diagram, spectra of manganese, sodium and aurora by J N [Joseph Norman] Lockyer Lockyer shares the spectra of manganese as observed in his investigations, sodium as observed by Ångström and 'the chief aurora line' as observed by Huggins. Includes a note to the engraver. In the published paper, this diagram is labelled as 'Diagram comparing the manganese fluting with the aurora line, the D lines being also shown for comparison.' Subject: Spectroscopy A print of this diagram was published in volume 46 of the Proceedings of the Royal Society alongside the paper 'On the wave-length of the chief fluting seen in the spectrum of manganese'. 1889