Homemade machine designed to detect the sound of an airplane motor

Title (Dublin Core): Homemade machine designed to detect the sound of an airplane motor
Subject (Dublin Core): en Technology; en Anti-aircraft; en Other
Article Title and/or Image Caption (Dublin Core): Listening for the Whir of an Airplane Motor
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): Interwar period
Date Issued (Dublin Core): 1919-02
Is Part Of (Dublin Core): Popular Science Monthly, v. 94, n. 2, 1919
pages (Bibliographic Ontology): 16
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): Europe