Dry plates
A photographic term used to describe gelatin coated plates in the days when wet collodion process was still popular.
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Dry Plates and Box Cameras
In 1871, Richard Maddox discovered gelatin could be used instead of glass for photographic plates. This step not only allowed for faster development but also paved the way for mass-produced film.
The dry plate.
From the 1830s through the 1860s, photo technology was focused on improving its chemistry.
This was fine and dandy, but there was one teensy problem with all these processes: they all used wet plates.
[edit] Dry plates
19th century studio camera
Collodion dry plates had been available since 1855, thanks to the work of Désiré van Monckhoven, ...
1871: Richard Leach Maddox, an English doctor, proposes the use of an emulsion of gelatin and silver bromide on a glass plate, the "dry plate" process.
and made and marketed motion picture film, dry plates and photographic paper. During its first three years, it was difficult for the company to create much brand recognition and, therefore, a sufficient share of the market.
In 1880, George developed and patented the "dry plate", which used a glass negative like his predecessor, but he mixed silver salts with gelatin instead of eggwhite, which meant that the plates could be dried.
In 1879 George Eastman, amateur photographer and employee of a bank in Rochester, had invented an emulsion-coating machine for mass production of dry plates and got a patent on it in England.
-Ansel Adams, The Camera "These people live again in print as intensely as when their images were captured on old dry plates of sixty years ago...
A suspension of silver salts in gelatin is coated onto acetate film or fiber-based or resin coated paper and allowed to dry (hence the term dry plate).
 See also: Plate, Photograph, Film, Photography, Image
  
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