December 30, 2007
Listen up!
What was the function of the structures you see at the three points marked on the map at this link?
(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.
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December 30th, 2007 at 10:17 am, GMT -0800 ( 1199038672 )
Apparatus for detecting aircraft from their engine noise, large concrete parabolic dishes and a parabolic wall
December 30th, 2007 at 10:48 am, GMT -0800 ( 1199040526 )
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War II as ‘Sound Mirrors’ to enable the detection of enemy planes.The sound mirrors did and still do work, but were superseded by Radar.
December 30th, 2007 at 11:56 am, GMT -0800 ( 1199044584 )
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
December 30th, 2007 at 1:15 pm, GMT -0800 ( 1199049301 )
acoustic location and sound mirrors. were used in the pre-radar days to detect or locate ships/airplanes.
http://www.dself.dsl.pipex.com.....ar/ear.htm
December 30th, 2007 at 7:46 pm, GMT -0800 ( 1199072798 )
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.
December 30th, 2007 at 8:51 pm, GMT -0800 ( 1199076716 )
acoustic mirrors on the kent coast, which apparently helped detect aircraft crossing the channel in pre-radar days
December 31st, 2007 at 12:51 am, GMT -0800 ( 1199091117 )
WW2 airborne-sonar installation - Apparatus for detecting aircraft from their engine noise through large concrete parabolic wall and dishes.
wikimapia is really useful :D
December 31st, 2007 at 1:32 am, GMT -0800 ( 1199093531 )
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.
December 31st, 2007 at 3:05 am, GMT -0800 ( 1199099125 )
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
http://www.dself.dsl.pipex.com.....ar/ear.htm
December 31st, 2007 at 6:00 am, GMT -0800 ( 1199109644 )
Acoustic mirrors used as primitive Radars.
December 31st, 2007 at 8:46 am, GMT -0800 ( 1199119562 )
denge acquistic mirrors to concentrate sound. an early attempt to track airplanes before radar.