World War One At Home - Holyhead Drive, Redcar: Sound Mirror Provides Early Warning - 大象传媒 Sounds

World War One At Home - Holyhead Drive, Redcar: Sound Mirror Provides Early Warning - 大象传媒 Sounds


Holyhead Drive, Redcar: Sound Mirror Provides Early Warning

The sound mirror used to give an early warning of German Zeppelin raids

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