Bayard, Hippolyte

b. 1801 Breteuil-sur-Noye, France d. 1887
French photographer, inventor of an early direct positive paper process.
Educated as a notary's clerk, Bayard began his working life in Paris in the Ministry of Finance. His interest in art led him to investigations into the chemical action of light, and he began his experiments in 1837. In May 1839 Bayard described an original photographic process which produced direct positive images on paper. It was devised independently of Talbot and before details of Daguerre's process had been published. During the same period, similar techniques were announced by other investigators and Bayard became involved in a series of priority disputes. Bayard's photographs were well received when first exhibited, and examples survive to the present day. Because the process required long exposure times it was rarely practised, but Bayard is generally credited with being an independent inventor of photography.
1840, Comptes rendus (24 February): 337 (the first published details of Bayard's process).
Further Reading
H.Gernsheim and A.Gernsheim, 1969, The History of Photography, rev. edn, London.

Biographical history of technology. - Taylor & Francis e-Librar. . 2005.

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