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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.
As a drawing aid, it allowed tracing the projected image to produce a highly accurate representation, and was especially appreciated as an easy way to achieve proper graphical perspective. Before the term camera obscura was first used in 1604, other terms were used to refer to the devices: cubiculum obscurum , cubiculum tenebricosum , conclave ...
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The Gundlach Periscope, usually known under its British designation as Vickers Tank Periscope MK.IV, was a revolutionary invention by Polish engineer Rudolf Gundlach, manufactured for Polish 7TP tanks from the end of 1935 and patented in 1936 as the Peryskop obrotowy Gundlacha.
The NFL, Apple Music and Roc Nation, who organize the massive football championship event, unveiled the 22-time Grammy Award-winning artist as this year's performer with a video of him launching ...
The WotWots is a New Zealand children's television show which debuted in 2009 and has since aired in several other countries worldwide. Created by Martin Baynton and Richard Taylor, the series uses a mix of live-action and computer animation to follow a pair of inquisitive, creative alien siblings as they learn about life on Earth.