As a military air defense tool, passive acoustic location was used from mid-World War I to the early years of World War II to detect enemy aircraft by picking up the noise of their engines. It was rendered obsolete before and during World War II by the introduction of radar, which was far more effective (but interceptable). Acoustic techniques had the advantage that they could 'see' around corners and over hills, due to sound refraction. [via wiki]
Czech one man aircraft locator
Russian anti-aircraft gunners with a device for "listening" to the sky.
1930's French locator.
Acoustic marine locator. Jean Auscher from France
This guy sure likes using this crazy contraption
These images remind me, for some reason, of the Whisper 2000 commercials:
The Dutch personal locator ~ 1930s |
A two-horn system at Bolling Field, USA, in 1921.The building in the background is the Army War College at Fort McNair. |
Czech one man aircraft locator
Russian anti-aircraft gunners with a device for "listening" to the sky.
1930's French locator.
Acoustic marine locator. Jean Auscher from France
Emperor Hirohito inspecting some impressive “war tubas” in the 1930s.
The experiments of the Rev J M Bacon ~ 1898. |
Dutch personal horns ~1930s |
This guy sure likes using this crazy contraption
These images remind me, for some reason, of the Whisper 2000 commercials:
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military photographs /
vintage photography /
WWI
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