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・ Dry loop
・ Dry Low Emission
・ Dry lubricant
・ Dry Martini (1928 film)
・ Dry matter
・ Dry measure
・ Dry meatballs
・ Dry media reaction
・ Dry Mesa Quarry
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Dry plate
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・ Dry powder inhaler
・ Dry process
・ Dry Prong, Louisiana
・ Dry punch
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・ Dry Range
・ Dry Ridge (disambiguation)
・ Dry Ridge Mountain
・ Dry Ridge, Kentucky
・ Dry Ridge, Ohio


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Dry plate : ウィキペディア英語版
Dry plate

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, allowing them to expand their business.
== Development ==
Gelatin emulsions, as proposed by Maddox, were very sensitive to touch and mechanical friction
and were not much more sensitive to light than collodion emulsions. Charles Bennett discovered a method of hardening the emulsion, making it more resistant to friction in 1873. In 1878, Bennett discovered that by prolonged heating, the sensitivity of the emulsion could be greatly increased. George Eastman developed a machine to coat plates in 1879 and opened the Eastman Film and Dry Plate Company,〔(University of Rochester History Dept ) Eastman Dry Plate〕 reducing the cost of photography. A competitor of Eastman in the development and manufacture of gelatin dry plates was the architectural photographer Albert Levy.〔Photography and the American Scene. A social history (1839-1889) by Robert Taft〕

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