PugJesus@piefed.socialM to HistoryPhotos@piefed.socialEnglish · 17 hours agoConcrete acoustic mirror for long-range aircraft detection, Kent, UK, 1930imagemessage-square5linkfedilinkarrow-up181arrow-down10 cross-posted to: militaryporn@lemmy.world
arrow-up181arrow-down1imageConcrete acoustic mirror for long-range aircraft detection, Kent, UK, 1930PugJesus@piefed.socialM to HistoryPhotos@piefed.socialEnglish · 17 hours agomessage-square5linkfedilink cross-posted to: militaryporn@lemmy.world
minus-squareEvil_ShrubberylinkfedilinkEnglisharrow-up2·9 hours agoAlong with a convenient microphone perch for birds right at the focal point …
Along with a convenient microphone perch for birds right at the focal point …