A new document into the sound mirrors in Dungeness, Kent. From Wikipedia, the free encyclopedia Denge is a former Royal Air Force site near Dungeness, in Kent, England. It is best known for the early experimental acoustic mirrors which remain there. The acoustic mirrors, known colloquially as 'listening ears', at Denge are located between Greatstone-on-Sea and Lydd airfield, on the banks of a now disused gravel pit. The mirrors were built in the late 1920s and early 1930s as an experimental early warning system for incoming aircraft, developed by Dr William Sansome Tucker. Several were built along the south and east coasts, but the complex at Denge is the best preserved. There are three acoustic mirrors in the complex, each consisting of a single concrete hemispherical reflector. The 200 foot mirror is a near vertical, curved wall, 200 feet (60m) long. It is one of only two similar acoustic mirrors in the world, the other being in Magħtab, Malta. 200 ft Acoustic mirror at Denge The 30 foot mirror is a circular dish, similar to a deeply curved satellite dish, 9 m (30 ft) across, supported on concrete buttresses. This mirror still retains the metal microphone pole at its centre. The 20 foot mirror is similar to the 30 foot mirror, with a smaller, shallower dish 6 m (20 ft) across. The design is close to that of an acoustic mirror in Kilnsea, East Riding of Yorkshire. Acoustic mirrors did work, and could effectively be used to detect slow moving enemy aircraft before they came into sight. They worked by concentrating sound waves towards a central point, where a microphone would have been located. However, their use was limited as aircraft became faster. Operators also found it difficult to distinguish between aircraft and seagoing vessels. In any case, they quickly became obsolete due to the invention of radar in 1932. The experiment was abandoned, and the mirrors left to decay. The gravel extraction works caused some undermining of at least one of the structures. The mirrors with the swing bridge visible in the foreground The striking forms of the sound mirrors have attracted artists and photographers. British artist Tacita Dean created a film inspired by the complex. The band Turin Brakes featured the mirrors on some of their album covers. The object appeared in the music video for Blank & Jones' "A Forest".The mirrors have also been featured in the music videos for Invaders Must Die by The Prodigy & Young Kato - Something Real. The mirrors are in the process of being transferred from the aggregate quarry owner to become part of a nature reserve. In 2003, English Heritage secured £500,000 from the Aggregates Levy Sustainability Fund and from the EU's Interreg programme under the Historic Fortifications Network, as administered by Kent Coun ... https://www.youtube.com/watch?v=JgVL4RsL3Wo

This is one of 8 PR1 & PR2, protected repeater stations built between 1951 and 1956. Each consists of a two level bunker with heavy blast doors. The bunkers are semi-sunken with the main distribution frames and repeater equipment and ventilation plant on the upper level above ground and more plant including standby generators and a high voltage sub station located in the lower floor below ground. www.subbrit.org.uk NEW WEBSITE: http://www.iks-exploration.co.uk/ Abandoned World: https://www.youtube.com/channel/UCdIT3q8Nqo7mSALM710izEw Instagram: https://instagram.com/abandoned_world_uk?utm_source=ig_profile_share&igshid=13i8pllqkivph IKS: https://www.instagram.com/iks_exploration_official/ https://www.facebook.com/iksexploration/ https://www.facebook.com/groups/iksproduction/ IKS Chris Instagram: https://www.instagram.com/chrisstacey.iks #IKS #bunkers #GPO #History #Documentaries ... https://www.youtube.com/watch?v=o12Fe2LK_S8