File:Acoustic Mirror Kent Great Britain.jpg
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Acoustic_Mirror_Kent_Great_Britain.jpg (640 × 427 pixels, file size: 55 KB, MIME type: image/jpeg)
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| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
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| Object location | | View this and other nearby images on: OpenStreetMap | |
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_region:GB-GBN_heading:270.00&language=en){kind=link}
| Description |
English: The largest of three concrete "sound mirrors" on the coast in Denge, Kent, England, built in the 1930s for air defence. Before radar was developed in World War 2 these were used to detect incoming enemy aircraft by listening for the sound of their engines. This "sound wall" was the largest, a curved wall about 5 m high by 70 m long. The wall focused all the sound coming from a particular direction to a point in front of the wall, the focus; an observer or microphone would be stationed there. The curve of the wall had a circular shape, rather than the parabolic shape used in many sound detectors. The circular shape allowed the sensitivity direction to be swept across the horizon by moving the microphone laterally. The structure is preserved for historical interest. |
| Date | Tuesday, 3 October, 2006 |
| Source | https://www.geograph.org.uk/photo/456554 |
| Author | Mark Duncan |
| Permission (Reusing this file) |
Creative Commons Licence |
Licensing[edit]
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This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by Mark Duncan and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Mark Duncan
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:20, 7 August 2007 | | 640 × 427 (55 KB) | Oxyman (talk | contribs) | {{Information |Description=Acoustic Mirror. |Source=http://www.geograph.org.uk/photo/456554 |Date=Tuesday, 3 October, 2006 |Author=Mark Duncan |Permission=Creative Commons Licence |other_versions= }} == Licensing == {{geograph|456554|Mark Dun |
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