Apparently unpublished paper by John Francis Campbell ‘written May, June, July 1879, extended 1880, 1881 and 1882’, on solar force, circular time scales and different atmospheric conditions in various parts of the world., 1879-1882., Adv.MS.50.6.13. Correspondence and papers, including many manuscripts in Gaelic, journals and yearbooks (with many photographs), albums of watercolour paintings and sketches, and experimental notebooks, of John Francis Campbell of Islay (1821-1885), Gaelic scholar and collector of oral tradition, traveller, scientist, official of the royal household and public servant., Adv.MSS.50.1.1-51.2.7. National Library of Scotland Archives and Manuscripts Division. https://manuscripts.nls.uk/repositories/2/archival_objects/16841 Accessed April 24, 2024.