British Government, Sound Mirrors, Greatstone Lakes, England, 1928-30 (via spectralfuturist)
‘The sound mirrors were part of Britain’s national defense strategy. They were designed to pick up the sound of approaching enemy aircraft.’
British Government, Sound Mirrors, Greatstone Lakes, England, 1928-30 (via spectralfuturist)
‘The sound mirrors were part of Britain’s national defense strategy. They were designed to pick up the sound of approaching enemy aircraft.’