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Daguerreotype portraits were made by the model posing before an exposed light-sensitive silvered copper plate. The fixing however was far from permanent – like the people they captured the images too were subject to change and decay.
In 1908 Neubronner patented his “Method of and Means for Taking Photographs of Landscapes from Above”, a lightweight miniature camera which could be strapped to a pigeon and activated by a timing mechanism.