Kent, UK. Between the World Wars, before the invention of radar, parabolic sound mirrors were used experimentally as early-warning devices by military air defence forces to detect incoming enemy aircraft by listening for the sound of their engines. #drone #dji pic.twitter.com/ncSkWVMcww
— Bryan Bruner (@Therobotarmy1) January 3, 2018
Filming with a drone – The Dungeness Sound Mirrors. pic.twitter.com/Kc2zZ0CZJW
— Tim Paine (@TimPaine) June 25, 2016
CEMEX UK commissioned ECP Video to produce a short documentary on the history of the gravel pit at Dungeness, which is now an RSPB nature reserve.