Portrait of William Henry Fox Talbot (early 1840s). Talbot invented and patented the negative/positive photographic process known as the calotype, which meant multiple copies of a picture could be printed. Ironically, the most successful portraits of Talbot were taken using the invention of his main rival Daguerre: the Daguerreotype
http://www.guardian.co.uk/artanddesign/gallery/2009/aug/04/photography-exhibition-british-library

http://www.theslideprojector.com/photo1/photo1lecturepresentations/photo1lecture4.html
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