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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.
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.
Typically the missile is steered with a joystick, and its path is observed through a periscope-type telescopic sight. The missiles are usually equipped with a magnesium flare in the base that automatically ignites on launch and allows the gunner to visually track the fast-moving missile in a manner similar in concept to tracer ammunition .
For targets under 1,000 m, the operator can guide the missile by eye; for targets beyond this range the operator uses the eight-power, 22.5-degree field of view, 9Sh16 periscope sight. The engagement envelope is a 3 kilometres (1.9 mi) wide, 45-degree arc centered on the missile's launch axis.
This type of sight has come to be used on all kinds of weapons from small firearms to fighter aircraft. It is also at the heart of all modern head-up displays . During the First World War , the Grubb factory was in demand for the production of telescopic gun-sights and during this time he was credited with perfecting a periscope design for ...
American soldiers using a coincidence rangefinder with its distinctive single eyepiece during army maneuvers in the 1940s. A coincidence rangefinder or coincidence telemeter is a type of rangefinder that uses the principle of triangulation and an optical device to allow an operator to determine the distance to a visible object.
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 ...
θ Deflection is the angle of the torpedo course relative to the periscope line of sight. Range plays no role in Equation 1 , which is true as long as the three assumptions are met. In fact, Equation 1 is the same equation solved by the mechanical sights of steerable torpedo tubes used on surface ships during World War I and World War II.