New "ears" listen for enemy planes

Title (Dublin Core): New "ears" listen for enemy planes
Subject (Dublin Core): en Technology; en Anti-aircraft
Article Title and/or Image Caption (Dublin Core): New airs listen for enemy planes
extracted text (Extract Text): A new-type sound detector for locating approaching
aircraft, being tested by the U.S. Army at recent
maneuvers. Like other devices of its kind, it picks
up faint vibrations from plane motors and propellers
and finds the direction from which they come, to aid
antiaircraft gunners. Other new developments in no-
tional defense are shown on the ten following pages
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): World War II
Date Issued (Dublin Core): 1940-10
Is Part Of (Dublin Core): Popular Science Monthly. v. 137. n. 4. 1940
pages (Bibliographic Ontology): 51
Rights (Dublin Core): Public domain
Source (Dublin Core): Google Books
References (Dublin Core): anti-aircraft gun
Archived by (Dublin Core): Sami Akbiyik; Marco Bortolami (editor)
Spatial Coverage (Dublin Core): United States Army