Skiopticon image from the Department of Photography at the Royal Institute of Technology. Use by Professor Helmer Bäckström as lecture material. Bäckström was Sweden's first professor in photography at the Royal Institute of Technology in Stockholm , Chemistry. Schematic representation of the developing process according to Web's silver electrode theory. (After Mees in Nature.) For more info see: Bäckström, Helmer. Photographic manual. Nature and Culture. Stockholm. 1942. p. 425.

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Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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