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Periscope

usgb/ˈperɪskəʊp/Volume
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LampPro Tip 1/3
Naval DevicePlay
Periscope is primarily associated with nautical use, especially in submarines for observation. SlideThe captain ordered, 'Extend the periscope,' to survey the horizon.
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Vertical MobilityPlay
Periscopes can move up or down to provide a safe way to observe without being exposed. SlideThe sailor raised the periscope carefully to remain undetected.
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Visibility AidPlay
Periscopes are useful when direct line of sight is blocked, allowing indirect viewing. SlideThey used the periscope to view the landscape beyond the wall.