Production year
1936
© Fonds historique / CNRS Images
Reference
19000001_0989
Cornet acoustique (mars 1936)
Cornet acoustique (mars 1936). La personne installée dans l'ouverture doit pouvoir entendre les sons émis à plusieurs kilomètres de distance. L'axe permet d'orienter le dispositif selon la zone d'émission. Office national des recherches scientifiques et industrielles et des inventions.
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