Periscope
Definition 1 of 2
Pro Tip 1/3
Naval Device
Periscope is primarily associated with nautical use, especially in submarines for observation. The captain ordered, 'Extend the periscope,' to survey the horizon.
Pro Tip 2/3
Vertical Mobility
Periscopes can move up or down to provide a safe way to observe without being exposed. The sailor raised the periscope carefully to remain undetected.
Pro Tip 3/3
Visibility Aid
Periscopes are useful when direct line of sight is blocked, allowing indirect viewing. They used the periscope to view the landscape beyond the wall.