Before radar existed, militaries relied on massive acoustic listening devices to detect incoming enemy aircraft. These giant “sound locators” used huge metal horns and parabolic dishes to amplify distant engine noise long before planes were visible in the sky. Operators wearing headphones would rotate the structure, pinpointing direction by listening to tiny shifts in sound. Though primitive by today’s standards, these early warning systems were cutting-edge technology in the 1920s and 1930s, giving countries precious minutes to prepare for incoming threats. They were eventually replaced by radar, but they remain a fascinating reminder of how human ingenuity solved problems long before modern electronics.
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