Brown/yellow observation of the Sun, 14 June 1905
Brown/yellow observation of sunspots made on 14 June 1905 at 5:30pm. On the reverse Willis has noted: "o. very clear, & air steady — 14.6.05. JW." and "Enlarged view of principal spot" which is delineated. o. refers to the astronomical symbol for the Sun. One of 275 pencil, ink and colour wash observations of the Sun and Jupiter made by Willis in Folkestone between 1879 and 1906.