1) English invention 
Dry plate, also known as gelatin process, is an improved type of photographic plate. It was invented by Dr. Richard L. Maddox in 1871, and by 1879 it was so well introduced that the first dry plate factory had been established. With much of the complex chemistry work centralized into a factory, the new process simplified the work of photographers,...
in photography, glass plate coated with a gelatin emulsion of silver bromide. It can be stored until exposure, and after exposure it can be brought ... [3 related articles]
dry plate process noun a former photographic method that used a glass plate coated with a light-sensitive gelatinous emulsion
a glass photographic plate coated with a sensitive emulsion of silver bromide and silver iodide in gelatin. · tin plate having patches of dull finish.