Kilnsea sound mirror in the Hull Daily Mail

6) Kilnsea Sound Mirror: Fears of attacks on Hull during the First World War led to the construction of this concrete “sound mirror”. The dish, a precursor of radar, would focus the sounds of distant engines to a listener. It is said they could identify surface vessels or aircraft up to 25 miles away.

10 TOP secret places in Hull and East Yorkshire. Hull Daily Mail, 28 February 2015.

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