Not directly related to sound mirrors (V2 rockets were supersonic), but sound mirror fans might be interested in London V2 Rocket Sites…Mapped at Londonist.
Acoustic early warning systems, spectacular remnants of a dead-end technology on the British coast
Not directly related to sound mirrors (V2 rockets were supersonic), but sound mirror fans might be interested in London V2 Rocket Sites…Mapped at Londonist.