The Lifeguard folding periscope by Edgar Duerr
The Lifeguard folding periscope invented and patented by Edgar Duerr, a second-generation family member. The life-saving instrument enabled front-line soldiers to observe enemy movements from 50cm (20 inches) below the parapet, providing them with a view of up to 91m (100 yards). Approved by the War Office and sold to individuals, the pocket-sized periscope weighed (20oz) and measured 11.5 x 11.5 x 5 cm (4.5 x 4.5 x 2inches) when closed
Picture No
11042258
Media ID
46896541
Size
6000px x 3929px
(5.0MB)
Credit
(c)Maurice Collins Images Collection /Mary Evans Picture Library
Source
Photograph of an original object in the Maurice Collins Collection
Date
1914
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