Diagrams, 'Spectrum of great nebula in Orion' by William Huggins and [Margaret Lindsay] Huggins Three spectra, labelled 'photograph of 1888', 'visible spectrum' and 'photograph of 1889' respectively. Subject: Astronomy / Spectroscopy These diagrams were published in volume 46 of the Proceedings of the Royal Society alongside the paper 'On the spectrum, visible and photographic, of the great nebula in Orion'. 1889