…you sometimes get a decent monument.
Here are the sound mirrors at Denge, Dungeness.
Lovely shot, but you really have to get up close to appreciate the sheer enormity of building those things. This idea isn't quite as dead as reported though: acoustic tracking of aircraft is coming back again, although with somewhat lighter technology, as the safe-airport project (http://www.safe-airport.org/).
For the geeky amongst us, links to:
* the safe-airport array characteristics (and a picture of the array): http://www.eurice.info/typo3sites/fileadmin/air-safety-cluster/downloads/Safe_Airport_Presentation.pdf
* wearable and bicycle-mounted sound mirrors: http://www.dself.dsl.pipex.com/MUSEUM/COMMS/ear/ear.htm
* I couldn't find any beam plots for the sound mirrors, but there might be something in the in-air acoustics bibliography at http://deepblue.lib.umich.edu/bitstream/2027.42/8244/4/ahp2921.0001.001.txt
Those are quite possibly some of the most humourous pictures I've ever seen. The personal device is, well, quite something…
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