Sir John Herschel

Sir John Herschel with Cap (1867) by Julia Margaret Cameron. Albumen print, National Portrait Gallery.

The origins of photography

Sir John Herschel first used the term photography in 1839, the year the photographic process became public. The word is derived from the Greek words for light and writing.

Two distinct scientific processes combined to make photography possible.

  1. Optical
  2. Chemical