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A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. [ 1 ] [ 2 ] In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle.
Schematic of a conventional and a periscope zoom lens A smartphone with a 5x optical zoom periscope lens camera, recognizable by the rectangular shape of its lens. A periscope lens, sometimes called a folded lens, is a mechanical assembly of lens elements that uses a prism or mirror to redirect the light through the lenses with a 90° angle to the optical axis, as in a periscope.
Periscope was an American live video streaming app for Android and iOS developed by Kayvon Beykpour and Joe Bernstein and acquired by Twitter, Inc. before its launch in March 2015. The service was discontinued on 31 March 2021 due to declining usage, product realignment, and high maintenance costs.
In March 2015, Twitter launched a livestreaming app called Periscope. Normally, users would see a hyperlink attached to their broadcast, directing people to a new tab. Using Periscope, videos appear live on the timeline. If the user has allowed the site to share information, others can see where the user is streaming from.
8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.
Virtual periscope is a system that allows submerged submarines to observe the surface above them without having to come to a shallower depth, as is required by traditional periscopes. The system, described in a patent as "Virtual Periscope", [ 1 ] was tested in 2005 aboard USS Chicago (SSN-721) .
Celestial navigation using the periscope, or sextant—seldom used anymore due to advancement in technology; Radar navigation; radar signals are easily detected so radar is normally only used in friendly waters entering and exiting ports. With the implementation of a more advanced radar system, many new techniques have been implemented in this ...
A periscope is a device for viewing things past obstacles. Periscope may also refer to: Periscope, 1999 stoner/psychedelic rock album by Colour Haze; Periscope (app), a video streaming app; Periscope (arcade game), a 1960s coin-operated arcade game by Namco and Sega; Le périscope, a 1916 film by Abel Gance