© Direction des Inventions, des études et des expériences techniques - Section de cinématographie technique de la direction des inventions - 1917

Perrin earphone

Reference

6670

Duration

00:02:50

Production year

1917

Versions

Original material

HD
16/9
BW
Mute

Director(s)

Summary

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.

Personality(ies)

Scientific topics

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