Sound Bombs as Air-Raid Warning

Title (Dublin Core): Sound Bombs as Air-Raid Warning
Subject (Dublin Core): en Technology; en Anti-aircraft
Article Title and/or Image Caption (Dublin Core): London Uses Sound Bombs as Air-Raid Warning; Caption: "A magazine containing six sound rockets, and a mortar from which they are fired: the police display "Take cover" notices at the same time the warnings are given".
Contributor (Dublin Core): International Film Service (photo)
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): World War I
Date Issued (Dublin Core): 1917-12
Is Part Of (Dublin Core): Popular Mechanics, v. 28, n. 6, 1917
pages (Bibliographic Ontology): 836
Rights (Dublin Core): Public Domain (Google digitized)
Source (Dublin Core): Google Books
Archived by (Dublin Core): Iacopo Tonon; Alberto Bordignon (Supervisor)
Spatial Coverage (Dublin Core): London