Airplane-height indicator for night flying

Title (Dublin Core): Airplane-height indicator for night flying
Subject (Dublin Core): en Technology; en Airplanes and Zeppelins
Article Title and/or Image Caption (Dublin Core): Airplane-height indicator for night flying
Language (Dublin Core): eng
Date Issued (Dublin Core): 1923-05
Is Part Of (Dublin Core): Popular Mechanics, v. 39, n. 5, 1923
pages (Bibliographic Ontology): 703
Rights (Dublin Core): public domain
Source (Dublin Core): google books
References (Dublin Core): National Institute of Standards and Technology
Archived by (Dublin Core): Marco Bortolami; Marco Bortolami (editor)