Sujet
United States April 2
Légende
United States April 2, 1925 Troops inspecting a newly-developed acoustic locator device, mounted on a wheeled platform. The large horns amplify the distant sounds of approaching enemy aircraft, enabling the aircraft defenders to derive their distance and altitude.
Date
1925
Crédit
Photo12/UIG/Underwood Archives
Notre référence
UMG23A55_481
Model release
Non
Property release
Non
Licence
Droits gérés
Format disponible
56,4Mo (2,2Mo) / 30,9cm x 45,7cm / 3653 x 5400 (300dpi)