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Air raid warning device, January 1918. Artist: Adolph Augustus Boucher.

Air raid warning device, January 1918. Artist: Adolph Augustus Boucher.

2-631-806 - Historic England/Heritage Images

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Air raid warning device, January 1918. Copy of two photographs showing a sound detector. During the First World War acoustic detection devices were used to warn of enemy aircraft. The photograph was taken for the Ministry of Munitions.

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