Zeppelins over the Northeast

To give early warning of raids, large concrete reflectors, or sound mirrors were built on the coast, to pick up the sound of airship engines with a microphone relaying the results to a nearby listener.

One sound mirror can be seen near Fulwell windmill in Sunderland.

Source: When war in the air came to the North East, Tony Henderson, The Journal, 3 February 2015.

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