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Pencil drawing by James Nasmyth "Group of Spots on the Sun

Pencil drawing by James Nasmyth "Group of Spots on the Sun

1880

Magnesium Hydride in Sun Spot

Magnesium Hydride in Sun Spot

1911

Photo-engraving from a photograph of sun spots, taken by Warren de La Rue with a 13-inch equatorially mounted reflector at his observatory at Cranford, Middlesex.

Photo-engraving from a photograph of sun spots

1858-1876

One of eight colour lithographs (Pl.14) with window mounts of four colour sketches showing sunspots in white light, drawn by Etienne Leopold Trouvelot in 1872. Figure 1, April 20th, 10h 00m; Figure 2, April 25th 11h 00m; Figure 3, April 26th 09h 30m; Figure 4, July 5th, 09h 30m;

Colour print of close-ups of the visible surface of the Sun, 1872.

1872