Acoustic Listening Devices

These photographs document different acoustic listening devices developed for the Dutch army as part of air defense systems research between World Wars 1 and 2.

dutch army acoustic listening devices- parabol-1

dutch army acoustic listening devices- goerz

dutch army acoustic listening devices- waalsd1 dutch army acoustic listening devices- waalsd2

dutch army acoustic listening devices- akoes30

v: but does it float

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3 Comments

  1. [...] Acoustic listening devices [...]

  2. [...] detect incoming enemy planes and Zeppelins across the Channel, it seems the Dutch were looking at amplification on more personal format.. I’m not sure if the Dutch preserved with these explosions of ear trumpet oddities but the [...]

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