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Angelo Sala
A scientist that worked with silver salts and said that "when powdered silver nitrate is exposed to the sun, it turns as black as ink." -
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Permanent images-Daguerreotype-Emulsion Plates
In the 1830's, Joseph Nicéphore Niépce used a portable camera obscura to expose a pewter plate coated with bitumen to light.(Permanent Images). That led to Daguerreotype; A copper plate was coated with silver and exposed to iodine vapor before it was exposed to light. That was later replaced by Emulsion Plates in the 1850's. Emulsion Plates were less expensive than Daguerreotypes and took only two or three seconds of exposure time. This made them much more suited to portrait photography. -
Sir John Herschel
Sir John Herschel came up with a way of making the first glass negative instead of using metal -
Dry Plates
Richard Maddox made dry gelatine plates. These dry plates could be stored rather than made as needed. This allowed photographers much more freedom in taking photographs -
Cameras for Everyone
George Eastman started a company called Kodak in the 1880s. Eastman created a flexible roll film that did not require the constant changing of solid plates. This allowed him to develop a self-contained box camera that held 100 exposures of film. This camera had a small single lens with no focusing adjustment. The consumer would take pictures and then send the camera back to the factory to for the film to be developed, much like our disposable cameras today.
