Production year
1937
© Fonds historique / CNRS Images
19000001_1021
Pendule électrique Jarry, photographiée le 13 mai 1937. Office national des recherches scientifiques et industrielles et des inventions (ONRSII). Son système fut conçu pour continuer à tourner lors d'une coupure de courant, assurant ainsi l'exactitude de l'heure. Ce temps de continuation de marche est limité, le pendule s'arrêtant si la panne se prolonge.
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1937
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