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The Sonos Arc, for example, accomplishes this via a pair of up-firing speakers, the idea being to bounce audio off the ceiling in addition to pointing it at your face. It's a nice feature to have ...
The arc is marked with divisions, almost always in degrees and fractions of a degree. In the oldest instruments, an indicator is placed at the centre of the arc . An observer can move a device with a second indicator along the arc until the line of sight from the movable device's indicator through the indicator at the centre of the arc aligns ...
NATO Accessory Rail (STANAG 4694) The NATO Accessory Rail (NAR), defined by NATO Standardization Agreement (STANAG) 4694, is a rail interface system standard for mounting accessory equipment such as telescopic sights, tactical lights, laser aiming modules, night vision devices, reflex sights, foregrips, bipods and bayonets to small arms such as rifles and pistols.
Arc flash is distinctly different from the arc blast, which is the supersonic shockwave produced when the uncontrolled arc vaporizes the metal conductors. Both are part of the same arc fault, and are often referred to as simply an arc flash, but from a safety standpoint they are often treated separately.
An arc lamp or arc light is a lamp that produces light by an electric arc (also called a voltaic arc). The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the first decade of the 1800s, was the first practical electric light .
"Billy" Bishop demonstrates use of Foster Mounting to fire upwards. The "quadrant" of the mounting is visible immediately below the gun barrel. In early 1916 Sergeant Foster of 11 Squadron RFC improved the French hinged mounting for the upper wing Lewis gun on a Nieuport 11 or 16, by replacing the awkward double hinge of the French mount with a quadrant-shaped I-beam rail. [1]
The ARC-210 is an improved version of the ARC-182, adding jam-reisistant SINCGARS capability to communicate with Army radios for close air support. [ 8 ] The ARC-182 was used in over 40 different U.S. fixed wing and rotary aircraft, as well as in ground, transportable and mobile applications, and was in service in 42 countries. [ 9 ]
An electric arc furnace (EAF) is a furnace that heats material by means of an electric arc. Industrial arc furnaces range in size from small units of approximately one-tonne capacity (used in foundries for producing cast iron products) up to about 400-tonne units used for secondary steelmaking.