'Sir Henry Roscoe', c1891. Henry Enfield Roscoe (1833-1915), English chemist noted for his early work on vanadium and for photochemical studies. In 1864 Roscoe is reputed to have produced the first flashlight photography, using magnesium as a light source. From The Cabinet Portrait Gallery. [Cassell & Company, Ltd, London, 1890-94]
