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Sound mirrors were built by the Royal Engineers from 1916 to the 1930’s. The sound mirrors were part of an extensive Zeppelin and enemy aircraft detection system that was built down the east coast of Britain during the First and Second World Wars.
The sound of an approaching aircraft was reflected off the concave mirror surface, and received into a trumpet mounted on a steel column. The trumpet was connected to a stethoscope that was used by the operator of the mirror. The operator was then able to tell from what direction that the aircraft were approaching by what part of the sound mirror produced the most sound. The operator would then warn the local authorities of an imminent attack. By the early 1940’s sound detection technology was replaced by what is know known as radar.
