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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.
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.
This is a list of United States Army fire control, and sighting material by supply catalog designation, or Standard Nomenclature List (SNL) group "F".The United States Army Ordnance Corps Supply Catalog used an alpha-numeric nomenclature system from about the mid-1920s to about 1958.
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, a live video streaming app for iOS and Android developed by Kayvon Beykpour and Joe Bernstein is launched (and acquired by Twitter before its launch). [48] 2015 May Companies Meerkat, a mobile app that enables users to broadcast live video streaming through their mobile device, releases its app for both iOS and Android. [49] 2016 January
An Elder-type periscope stock fitted to an American M1903 Springfield rifle (1918); the rifle is also fitted with a 25-round magazine. [15] The Dutch M.95 periscope rifle. Two Lee–Enfield periscope adaptations were patented in September 1915. The first by J.E. Chandler was able to fire a full magazine before being dismounted, thanks to a ...
Edme Hippolyte Marié-Davy (28 April 1820 – 26 July 1893) was a French chemist and inventor during the 19th century. He was born in Clamecy, Nièvre.. In 1854, he invented the first naval periscope, consisting in a vertical tube with two small mirrors fixed at each end at 45°.
Also, "periscope feather" (the wave created by the snorkel or periscope moving through the water) can be spotted in calm seas. During the early months of the Battle of the Atlantic in World War II, British ships using the radar set Model 271 were able to detect the periscope of a submerged submarine at a distance of 800 m (0.50 mi) during tests ...