File:Acoustic mirror Sunderland nr Fulwell Mill 2021.jpg

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Captions

Captions

Acoustic mirror used for air defense during 1914-18

Summary[edit]

Description
English: Acoustic mirror built circa 1914 in Fulwell, Sunderland. To detect German aircraft and Zeppelins. Giving the allies 15 minutes warning.
Date
Source Own work
Author Stanley John James

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current20:02, 10 May 2024Thumbnail for version as of 20:02, 10 May 20245,184 × 3,888 (7.53 MB)Stanley John James (talk | contribs)Uploaded own work with UploadWizard

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