Listening to planes
Sunday, August 17, 2008
In the early years of flying, before they invented the radar as we know it, detecting planes from the distance could be a real bitch sometimes. The army used all kinds of acoustic location devices.

Above is a picture of a two-horn acoustic location system at Bolling Field, USA, in 1921.
Read more about Acoustic Location and Sound Mirrors.

Above is a picture of a two-horn acoustic location system at Bolling Field, USA, in 1921.
Read more about Acoustic Location and Sound Mirrors.
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