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periscope |
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periscopeOptical instrument designed for observation from a concealed position such as from a submerged submarine. In its basic form it consists of a tube with parallel mirrors at each end, inclined at 45° to its axis. The periscope attained prominence in naval and military operations of World War I. Although most often thought of as a submarine observation device, periscopes were widely used in the trenches during World War I to allow observation without exposing the observer, and special versions were also developed to be attached to rifles. |
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Almost at their side the periscope of a submarine had suddenly appeared. At first they sought to discover his location in No Man's Land; but when an officer looking over the parapet through a periscope was struck full in the back of the head with a rifle bullet which passed through his skull and fell to the bottom of the trench they realized that it was beyond the parados rather than the parapet that they should search. I rose, also, and over the ship's side, I saw not two hundred yards distant the periscope of a submarine, while racing toward the liner the wake of a torpedo was distinctly visible. |
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periscope
