A 30ft Sound Mirror. Similar to the better preserved example at Greatstone-on-Sea.
They were a fore-runner to radar, intended to pinpoint enemy aircraft by magnifying
the sound of their engines and focusing it at a listening position. There is some
doubt as to there effectiveness, but they were never used as they became superseded
On the hillside above the Military Canal. Can be viewed from a footpath up the going
hill. It was showing serious deterioration in 2011, with a large chunk having fallen