Sir John Frederick William Herschel, 1865.
© National Media Museum / Science & Society Picture Library
Herschel (1792-1871) was an astronomer and scientist who was awarded numerous honours for his work in astronomy. He was also interested in photography; he was the first to use the word 'photography', and applied the terms 'positive' and 'negative' to the subject. He discovered that hyposulphate quickened the development of photographs, and invented the blueprint (or cyanotype) proces. Photograph by Julia Margaret Cameron (1815-1879). Cameron's portraits are considered among the best in early photography.