Drama! Intrigue! Geekiness!

December 30, 2007

Listen up!

srikanth @ 9:45 am, GMT +0000 ( 1199007944 ) Play

What was the function of the structures you see at the three points marked on the map at this link? UTF8&hl=en&msa=0& msid=104245191237712906664.000 4427e679acbfa0f156&ll=50.95596, 0.953665 &spn=0.00171,0.004334&t=h&z=18&om=1

(Your browser will have to be able to handle Google maps if you want to get this one)

Here’s another clue:


Cracked by: udupendra , jayanth , madhur , vaibhav008 , Dibyo , nishas thambi , prasanth , nishansolo , shenoyvarun86 , bs and sidsen.

Answer: Is Acoustic Mirrors. Japanese War Tuba is the clue.

11 Responses to “Listen up!”

  1. udupendra

    Apparatus for detecting aircraft from their engine noise, large concrete parabolic dishes and a parabolic wall

  2. Sound Mirrors: Just outside Lydd, near Dungeness,there are several domes between 20 and 30 feet high. These were built by the War Department in 1928 just prior to World War II as ‘Sound Mirrors’ to enable the detection of enemy planes.The sound mirrors did and still do work, but were superseded by Radar.

  3. madhur

    The 3 points together form The Listening Devices at GreatStone, Kent, England built in 1928.

    The Listening Devices are three scheduled ancient monuments (Locator Wall and parabolic mirrors) built for the acoustic detection of enemy aircraft by using the sound properties of reinforced concrete parabolic mirrors. Used between 1928 and outbreak of World war II

  4. vaibhav008

    acoustic location and sound mirrors. were used in the pre-radar days to detect or locate ships/airplanes.

  5. Dibyo

    The places shown are likely to have ‘Acoustic Mirrors’, which were used during the war as an early warning system.

    The other pic is a Japanese War Tuba, used for similar purposes.

    Acoustic location was used from mid-World War I to the early years of World War II for the passive detection of aircraft by picking up the noise of the engines. It was rendered obsolete before and during World War II by the introduction of radar, which was far more effective.

  6. nishas thambi

    acoustic mirrors on the kent coast, which apparently helped detect aircraft crossing the channel in pre-radar days

  7. prasanth

    WW2 airborne-sonar installation – Apparatus for detecting aircraft from their engine noise through large concrete parabolic wall and dishes.

    wikimapia is really useful :D

  8. nishansolo

    The picture is that of the sound detectors at Greatstone Village, in coastal Britain. Due to their closeness to mainland Europe, it was used as huge ‘listening ears’ to detect German aircaft during World War 2.

    During the war they were superceded by the invention of radar.

  9. The japanese War tubas and the AA guns
    the tubas were used as acoustic radars.
    Principle is Acoustic location :the use of sound for loaction of ships or any object

  10. bs

    Acoustic mirrors used as primitive Radars.

  11. sidsen

    denge acquistic mirrors to concentrate sound. an early attempt to track airplanes before radar.

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