Sujet
Air raid warning device, World War I, 1918
Légende
Air raid warning device, World War I, 1918. Copy of two photographs showing a sound detector. During the First World War acoustic detection devices were used to warn of enemy aircraft. The photographs were taken for the Ministry of Munitions.
Date
1918
Crédit
Photo12/Heritage Images/Historic England Archive
Notre référence
HRM19B38_117
Model release
Non
Licence
Droits gérés
Format disponible
49,5Mo (2,3Mo) / 41,7cm x 29,7cm / 4929 x 3510 (300dpi)