Diagrams, 'Most widened lines in Sun-spot spectra' by J [Joseph] Norman Lockyer Two diagrams relating to sunspot spectra, showing the F-beta region and the beta-D region respectively. Subject: Astronomy / Spectroscopy Prints of these diagrams were published in volume 46 of the Proceedings of the Royal Society alongside the paper 'Further discussion of the sun-spot observations made at South Kensington. A report to the solar physics committee. Communicated to the Royal Society at the request of the committee'. 1889