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1 Cros, Hortensius Emile Charles
[br]b. 1 October 1842 Fabrezan (Aude), Franced. 9 August 1888 Paris, France[br]French inventor of chromolithography and the principles of reproducible sound recording.[br]He received no formal education, but was brought up by his father, a distinguished teacher and philosopher. He dabbled in diverse subjects (modern and ancient languages, mathematics, drawing) in 1856–60 when he became an instructor at the institute of the Deaf-Mute at Paris. He became a prolific inventor and poet and took part in artistic life in Paris. In the 1867 Exposition Universelle in Paris, Cros contributed a facsimile telegraph; he deposited with the Académie des Sciences a sealed text on photography which was not opened until 1876. In the meantime he published a small text on a general solution of the problem of colour photography which appeared almost simultaneously with a similar publication by Louis Ducos du Hauron and which gave rise to bitter discussions over priority. He deposited a sealed paper on 18 April 1877 concerning his concept of apparatus for recording and reproduction of sound which he called the paléophone. When it was opened on 3 December 1877 it was not known that T.A. Edison was already active in this field: Cros is considered the conceptual founder of reproducible sound, whereas Edison was the first "to reduce to practice", which is one of the US criteria for patentability.[br]BibliographyFrench patent no. 124, 213 (filed 1 May and 2 August 1878).Further ReadingLouis Forestier, 1969, Charles Cros: L'Homme et l'oeuvre, Paris: Seghers.GB-NBiographical history of technology > Cros, Hortensius Emile Charles
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2 Photography, film and optics
See also: INDEX BY SUBJECT AREA[br]Ding HuanGabor, DennisKlic, KarolLippershey, HansMarton, LadislausTournachon, Gaspard FélixBiographical history of technology > Photography, film and optics
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3 Telecommunications
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4 Recording
See also: INDEX BY SUBJECT AREA[br]
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