Production year
2011
© Fonds historique / CNRS Images
19000001_1120
Brevet d'invention du posographe, déposé le 8 octobre 1921. Mis au point par Auguste Robert Kaufmann, le posographe est destiné à déterminer le temps de pose pour la photographie. Il compte parmi les rares trouvailles qui ont survécu à la grande dispersion du temps. Page de la revue Recherches et Inventions, une revue de l'Office national des recherches scientifiques et industrielles et des inventions du ministère de l'instruction publique.
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2011
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