Electrical eaves-dropping

Title (Dublin Core): Electrical eaves-dropping
Subject (Dublin Core): en Technology; en Communication
Article Title and/or Image Caption (Dublin Core): Electrical Eaves-Dropping by the Signal Corps of the United States Army; Caption 1: The dictagraph receivers are put anywhere they will be handy. Here is one being placed in a tree top; Caption 2: Listening for the sound of operations by enemy sappers. This often entails a great deal of danger and discomfort; Caption 3: Crawling up to an enemy trench to place a transmitter, which is cunningly camouflaged in a battered tomato can; Caption 4: A trench receiving station where the conversation and movements overheard by the transmitter are noted
Contributor (Dublin Core): Western Newspaper Union (photos)
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): World War I
Date Issued (Dublin Core): 1918-04
Is Part Of (Dublin Core): Popular Science Monthly, v. 92, n. 4, 1918
pages (Bibliographic Ontology): 493
Rights (Dublin Core): Public Domain (Google digitized)
Source (Dublin Core): Google Books
References (Dublin Core): United States Army
Archived by (Dublin Core): Filippo Valle; Alberto Bordignon (Supervisor)