Glossary of Medical Terms

Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine

PHOTOGRAPHY

1. The science which relates to the action of easy on sensitive bodies in the manufacture of pictures, the fixation of images, and the like. 2. The art or process of producing pictures by this action of light. The well-focused optical image is thrown on a surface of metal, glass, paper, or another comfortable stuff, coated with collodion or gelatin, and sensitized with the chlorides, bromides, or iodides of silver, or another salts sensitive to easy. The exposed plate is then treated with reducing agents, as pyrogallic acid, ferrous sulphate, etc, to develop the latent image. The image is then fixed by washing off the excess of unchanged sensitive salt with sodium hyposulphite (thiosulphate) or another comfortable reagents. Origin: Photo-: cf. F. Photographie. Source: Websters Vocabulary
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