Periscope used in French trenches

Title (Dublin Core): Periscope used in French trenches
Subject (Dublin Core): en Technology; en Trenches and fortifications; en Reconnaisance
Article Title and/or Image Caption (Dublin Core): Caption: "Lookout on the French line watching the movements of the enemy through a periscope".
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): World War I
Date Issued (Dublin Core): 1915-03
Is Part Of (Dublin Core): Popular Mechanics, v. 23, n. 3, 1915
pages (Bibliographic Ontology): 365
Rights (Dublin Core): Public domain (Google digitized)
Source (Dublin Core): Google Books
Archived by (Dublin Core): Iacopo Tonon; Davide Donà (supervisor)
Spatial Coverage (Dublin Core): French Third Republic