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convex dish blue plaque

Blue plaque
convex dish blue plaque
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What is recorded here

This blue commemorative plaque records: 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 Recorded plaque organisation: City of Sunderland.
The convex dish served as an early detection system during World War I, identifying incoming German Zeppelins and providing crucial advance notice for anti-aircraft defenses in Sunderland.

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Photo: Millerdl on Wikimedia Commons · CC BY-SA 4.0