Employ echo for mesauring the depth of the ocean

Title (Dublin Core): Employ echo for mesauring the depth of the ocean
Subject (Dublin Core): en Technology; en Anti-submarines; en Trivialization (other)
Article Title and/or Image Caption (Dublin Core): Employ echo for mesauring the depth of the ocean
Language (Dublin Core): eng
Date Issued (Dublin Core): 1922-05
Is Part Of (Dublin Core): Popular Mechanics, v. 37, n. 5, 1922
pages (Bibliographic Ontology): 689
Rights (Dublin Core): public domain
Source (Dublin Core): google books
References (Dublin Core): sonar
Archived by (Dublin Core): Marco Bortolami; Marco Bortolami (editor)