Production year
2011
© Fonds historique / CNRS Images
19000001_1123
Schéma du principe de fonctionnement du posographe, dont le brevet a été 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. 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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