Air raid warning device
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. Bedford Lemere, 1918
Picture No
11959498
Media ID
45356969
Size
4929px x 3510px
(9.4MB)
Credit
© Historic England / Mary Evans Picture Library~~
Source
Historic England Archive - Adolph Augustus Boucher
Date
1918
