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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.
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Photo credits
- John M, Wikimedia Commons · CC BY-SA 2.0
- rob bishop, Wikimedia Commons · CC BY-SA 2.0
- Chris Allen, Wikimedia Commons · CC BY-SA 2.0
- JThomas, Wikimedia Commons · CC BY-SA 2.0
- Mike Quinn, Wikimedia Commons · CC BY-SA 2.0
- Weston Beggard, Wikimedia Commons · CC BY-SA 2.0
- Rossographer, Wikimedia Commons · CC BY-SA 2.0
- trevor willis, Wikimedia Commons · CC BY-SA 2.0
- Tim Heaton, Wikimedia Commons · CC BY-SA 2.0

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