Sound "Bullets" for Fog Navigation

Title: Sound "Bullets" for Fog Navigation
Subject: en Technology; en Ships
Article Title and/or Image Caption: The Scientific American Digest, Sound "Bullets" for Fog Navigation
Contributor: F.D. McHugh (editor)
Language: ENG
Temporal Coverage: interwar period
Date Issued: 1932-04
Is Part Of: Scientific American, v.1 46, n. 4, 1932
Rights: Public Domain
References: General Electric; New London
Archived by: Lara Azzolini