convex dish blue plaque

Sunderland, Sunderland, England, United Kingdom

City of Sunderland Coastal Watch Mirror This convex dish detected German Zeppelins sent to bomb north-east ports. Their course could be judged from engine sounds focussed onto a receiver, giving 15 minutes warning for anti-aircraft defences to be directed onto them. World War I Defences

Listen to the audio guide for convex dish blue plaque Free on WIP — starts by itself when you arrive, even with the screen off