[kellyhound]

The Japanese war tuba, "Large air sound detector ninety formula".

The name derived from a misidentification, possibly in jest, of a historical photo from the 1930s featuring the Japanese emperor Shōwa inspecting the acoustic locators with anti-aircraft guns in the background.

Acoustic location devices were used by military services from mid-World War I to the early years of World War II for the passive detection of approaching enemy aircraft by listening for the noise of their engines.

These typically consisted of large acoustic horns attached to stethoscope-type earphones worn by monitors.

This technology was rendered obsolete before and during World War II by the introduction of radar, which was far more effective.

Some examples of parabolic concrete acoustic location mirrors can still be found on the seacoast of Britain to this day.

[Sterlig]

Huh, they really do look like giant tubas. I wonder what they would sound like if made into an instrument, I bet it'd be pretty awesome.

[JackN]

Interesting post!

[Kelseecat65]

Very cool!!

[murofhsirgo]

and yet another cool post right up my alley, thanks

[William May]

I used to have a set of those....I used it in the Ringling Bros. circus parade in Milwaukee, the same year they had the 100 horse hitch wagon. My set was steam powered. They are only good for playing low notes.

[deanmine]

Japs were very cleaver in the there usage of tactics to gain the upper hand in war... They Used There Knowledge Of The Gulf Stream Wind and Water Currents.. they took fuckin balloons .. put a bomb on em.... and they made it to america.. even killed a few family members....oh.. i just will make a fuckin thread on it... stupid me....