Photography

Pho*tog"ra*phy

(?), n. [Photo- + -graphy: cf. F. photographie.] 1. The science which relates to the action of light on sensitive bodies in the production of pictures, the fixation of images, and the like.
[1913 Webster]

2. The art or process of producing pictures by this action of light.
[1913 Webster]

The well-focused optical image is thrown on a surface of metal, glass, paper, or other suitable substance, coated with collodion or gelatin, and sensitized with the chlorides, bromides, or iodides of silver, or other salts sensitive to light. 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 other suitable reagents.
[1913 Webster]


[1913 Webster]

 

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Wed 19th December 2018