Take a look at the photo - what is seen in the distance? Station space communications? Missile defense? Or is it the ancient traces of aliens? The project, which we will tell you, has been launched for a long time and has an uncertain future. However, it is interesting, since combines the unknown pages of art, Napoleon, Count Zeppelin, a little art and a completely crazy idea.
Several years ago, a British artist, Danish-born Liz Otodzhena (Lise Autogena) was traveling in his car along the coast of the English Channel. From a distance she saw a strange structure, standing on high ground. She was intrigued, and when they looked close - just fascinated. So can charm abandoned 50-70 years ago, the plant, a dam or a building, dilapidated building of a bygone era in which guessed grandeur and power. Huge concrete plates and bowls, converts the concave side toward the continent, as it turned out, were a "listening ears" or "Sound Mirrors".
The original purpose of these buildings- to capture the sound of engines airship Zeppelin and German airplanes during WWI. Man standing on guard of the British palate, located at the focus of a mirror or in a special chamber beneath. In the latter case, the sound is transmitted into the - into the ears of the operator directly through the tube-like tube stethoscope, only a manifold increase in length.
In the twenties and thirties optimized process: focus placed microphone and transmit sound to the bunker under the "acoustic mirror" - could detect not only the aircraft, but the noise of the engines and vehicles. Mirrors were made (mostly) in the form of a giant (diameter up to 9, 1 meter) concrete bowls Chagall, converts the concave side towards the sea. But there were mirrors and a huge semi-circular (in plan) wall length of 60 meters and a height of five meters.
Such structures were built from 1916 to 1930 more than a dozen sites on the east and south-east coast of Albion. "The ears of Britain." No more no less. And after the First World War they worked. And later - too. They have lost their relevance only in the course of the Second World War, with the practical development of the radar (the pioneers here, by the way, were just the United Kingdom, as well as - the USSR).
A lot of them - are built along the coast of Kent, in Sunderland, Kilnsey, Bowlby and so on. In the interwar period, the British built Mirrors even in Malta. All this combined with a very conventional acoustic locator:
By 1940, these gizmos finally obsolete - was invented radar - but its role in the Battle of Britain played: acoustic warning system along the banks served more than 1,000 people from the Royal Air Force.
We also add that in sonar enemy planes during World War II were successfully used and traps much smaller - metal bells which are steered in all directions on a special bracket. However, these devices are familiar to fans of technology is much better than the huge sound mirrors the English Channel coast.