Two sound-collecting instruments used by the Allies to locate airplanes during World War I

Title (Dublin Core): Two sound-collecting instruments used by the Allies to locate airplanes during World War I
Subject (Dublin Core): en Technology; en Airplanes and Zeppelins; en Anti-aircraft
Article Title and/or Image Caption (Dublin Core): Where Is That Airplane?
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): Interwar period
Date Issued (Dublin Core): 1919-06
Is Part Of (Dublin Core): Popular Science Monthly, v. 94, n. 6, 1919
pages (Bibliographic Ontology): 50
Rights (Dublin Core): Public domain (Google digitized)
Source (Dublin Core): Google Books
Archived by (Dublin Core): Davide Donà; Marco Bortolami (editor)
Spatial Coverage (Dublin Core): Western Front of World War I; Europe