An apparatus consisting of a tube attached to a set of mirrors or prisms, by which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight.
- The commander has seven optical periscopes which provide 360° observation and a dedicated sight for weapon aiming.
- The driver is equipped with three forward periscopes plus one periscope to the left.
- Since mines don't emit sounds, produce heat, make transient sounds or poke periscopes through the surface of the water to attack their prey, minemen have to look for shapes.
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