Redcar sound mirror
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The sound mirror at Redcar on the Yorkshire coast was built in about 1916, during the First World War.
These pictures were taken in December 2002. Click on a picture to see a bigger version.
![The sound mirror from the north [Picture of the mirror]](http://www.ajg41.plus.com/images/mirror/redcar3small.jpg)
The mirror at redcar has a modern plaque explaining what it is. The base for the listening apparatus has survived, about four feet in front of the main structure.