© Direction des Inventions, des études et des expériences techniques - Section de cinématographie technique de la direction des inventions - 1917
Fonds Historique / CNRS Images

Reference

6670

Perrin earphone

The High Commission of the Directorate of Inventions is studying Jean Perrin's acoustic device designed for the French army to pinpoint enemy positions precisely by sound detection.

Duration

00:02:50

Production year

Définition

HD

Color

BW

Sound

Mute

Version(s)

French

Original material

35 mm Film

Personality(ies)

Scientific topics

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