John Herschel, English astronomer and scientist, 1866-1871.

Carte de visite photograph taken by Maull & Co. Sir John Herschel (1792-1871) the son of Sir William Herschel (1738-1822), who discovered the planet Uranus. Herschel followed his father in astronomical research, mapping the sky of the southern hemisphere and cataloguing many previously unseen stars. He was also a pioneer photographer, and coined the photographic terms 'negative and 'positive'.