Abbot’s Cliff Sound Mirror was built in 1928 as part of a group of acoustic mirrors along the Kentish Channel Coast, and this one, near Capel Le Ferne in Folkestone, was one of a pair built to bracket the Acoustic Research Station at Hythe, the second one being in Denge. They were designed as an early warning system for Britain to detect enemy aircraft and this sound detecting acoustic dishes and walls could detect the sound of approaching enemy aircraft at a distance of 8 to 15 miles. They were made redundant with the introduction of RADAR technology. The Abbot’s Cliff Sound Mirror is found alongside a footpath on the long walk between Etchinghill and Dover on the North Downs Way.

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