Diagrams and photographs, meteor spectroscopy by Joseph Norman Lockyer A photograph of the spectra of alcohol at different pressures, a photograph of a 'large end vacuum-tube, arranged for an observation of the spectrum of air at varying pressures' and seven diagrams of graphs and spectra relating to Lockyer's investigations. Subject: Astronomy / Spectroscopy Prints of these diagrams and photographs were published in volume 45 of the Proceedings of the Royal Society alongside the paper 'Appendix to the Bakerian lecture, session 1887-88'. 1888