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Stroboscopic Cupola
Stroboscopic cupola was a historical tank cupola design consisting of armoured outer and inner cylinders, both pierced by several regularly spaced vertical vision slits around the circumference. Rapidly rotating the external cylinder (in case of the Char 2C tank design at 300 rpm with an electric motor) created the visual illusion of seeing through the cupola as if not there due to human persistence of vision Persistence of vision traditionally refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye. The illusion has also been d ..., similar to how a plank fence with alternating planks and holes fades from view when the observer moves alongside it at a speed. The short time both the inner and outer slits were perfectly aligned at any given moment still afforded protection of the inside space, as any projectile not capable of piercing the armour directly woul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tank
A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and good battlefield mobility provided by tracks and a powerful engine; usually their main armament is mounted in a turret. They are a mainstay of modern 20th and 21st century ground forces and a key part of combined arms combat. Modern tanks are versatile mobile land weapons platforms whose main armament is a large-caliber tank gun mounted in a rotating gun turret, supplemented by machine guns or other ranged weapons such as anti-tank guided missiles or rocket launchers. They have heavy vehicle armour which provides protection for the crew, the vehicle's munition storage, fuel tank and propulsion systems. The use of tracks rather than wheels provides improved operational mobility which allows the tank to overcome rugged terrain and adverse conditions such as mud and ice/snow better than wheeled vehicles, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylinder (geometry)
A cylinder (from ) has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an infinite curvilinear surface in various modern branches of geometry and topology. The shift in the basic meaning—solid versus surface (as in ball and sphere)—has created some ambiguity with terminology. The two concepts may be distinguished by referring to solid cylinders and cylindrical surfaces. In the literature the unadorned term cylinder could refer to either of these or to an even more specialized object, the ''right circular cylinder''. Types The definitions and results in this section are taken from the 1913 text ''Plane and Solid Geometry'' by George Wentworth and David Eugene Smith . A ' is a surface consisting of all the points on all the lines which are parallel to a given line and which pass through a fixed plane curve in a pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Char 2C
The Char 2C, also known as the FCM 2C, was a French heavy tank, later also seen as a super-heavy tank. It was developed during World War I but not deployed until after the war. It was, in total volume or physical dimensions, the largest operational tank ever made. Development The ''Char d'assaut de grand modèle'' The origins of the Char 2C have always been shrouded in a certain mystery. In the summer of 1916, likely in July,Guy François, 2011, "Le char lourd FCM 1A, ou le rêve immolé", ''Histoire de Guerre, Blindés & Matériel'', 98: 42-51 General Léon Augustin Jean Marie Mourret, the Subsecretary of Artillery, verbally granted ''Forges et Chantiers de la Méditerranée'' (FCM), a shipyard in the south of France near Toulon, the contract for the development of a heavy tank, a ''char d'assaut de grand modèle''. At the time, French industry was very active in lobbying for defence orders, using their connections with high-placed officials and officers to obtain commi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Persistence Of Vision
Persistence of vision traditionally refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye. The illusion has also been described as "retinal persistence", "persistence of impressions", simply "persistence" and other variations. A very commonly given example of the phenomenon is the apparent fiery trail of a glowing coal or burning stick while it is whirled around in the dark. Many explanations of the illusion actually seem to describe either positive afterimages or motion blur. "Persistence of vision" can also be understood to mean the same as "flicker fusion," the effect that vision seems to persist continuously when the light that enters the eyes is interrupted with short and regular intervals. When the frequency is too high for the visual system to discern differences between moments, light and dark impressions fuse together into a continuous impressio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
