The Daguerreotype was the first successful photographic process, the discovery being announced on 7 January 1839.
<Context ref.>A History of Photography, by Robert Leggat: The DAGUERREOTYPE [En línia]. [Consulta: 26 juliol 2005]. Disponible a: <http://www.rleggat.com/photohistory/history/daguerro.htm>