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  2. Heavy Anti-Aircraft Gun Station 385 - Wikipedia

    en.wikipedia.org/wiki/Heavy_Anti-Aircraft_Gun...

    In 2019, Gun Station 385 is located within the Caltex oil refinery to the east of Fort Lytton National Park, and retains: four above-ground gun emplacements for 3.7 inch (94mm) anti-aircraft guns, consisting of octagonal gun pits, formed of cinder blocks and concrete, surrounded on seven sides by earth revetments; and a semi-underground ...

  3. Defensive fighting position - Wikipedia

    en.wikipedia.org/wiki/Defensive_fighting_position

    A foxhole is one type of defensive strategic position. It is a "small pit used for cover, usually for one or two personnel, and so constructed that the occupants can effectively fire from it". [ 1 ] It is known more commonly within United States Army slang as a " fighting position " or as a " ranger grave ". It is known as a " fighting hole ...

  4. Fire brick - Wikipedia

    en.wikipedia.org/wiki/Fire_brick

    A fire brick, firebrick, fireclay brick, or refractory brick is a block of ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency. Usually dense fire bricks are used in ...

  5. British hardened field defences of World War II - Wikipedia

    en.wikipedia.org/wiki/British_hardened_field...

    The turret was set above a pit; in early designs, the pit was formed by a standard section of concrete pipe 4 feet (1.2 m) in diameter. [ 95 ] [ 96 ] Only five examples were thought to remain, all at former RAF Hornchurch, [ 95 ] but two well-preserved examples were rediscovered in 2014 in Docking in North Norfolk.

  6. Earth shelter - Wikipedia

    en.wikipedia.org/wiki/Earth_shelter

    Concrete is the most common choice for constructing earth-sheltered buildings due to its strength, durability, and fire resistance. Cast-in-place concrete is employed for non-critical structural elements such as concrete foundations, floor slabs, and exterior walls with less than 6 feet (1.8 meters) of earth cover, while precast reinforced ...

  7. Brick - Wikipedia

    en.wikipedia.org/wiki/Brick

    A wall constructed in glazed-headed Flemish bond with bricks of various shades and lengths. An old brick wall in English bond laid with alternating courses of headers and stretchers. A brick is a type of construction material used to build walls, pavements and other elements in masonry construction. Properly, the term brick denotes a unit ...

  8. Scoria - Wikipedia

    en.wikipedia.org/wiki/Scoria

    Scoria is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form discrete grains called clasts. [1][2] It is typically dark in color (brown, black or purplish-red), and basaltic or andesitic in composition. Scoria has relatively low density, as it is riddled ...

  9. Anaconda Smelter Stack - Wikipedia

    en.wikipedia.org/wiki/Anaconda_Smelter_Stack

    Anaconda Smelter Stack. The Anaconda Smelter Stack is the tallest surviving masonry structure in the world, with an overall height of about 585 feet (178.3 m), including a brick chimney 555 feet (169.2 m) tall and the downhill side of a concrete foundation 30 feet (9.1 m) tall. [ 2 ][ 3 ][ A ] It is a brick smoke stack or chimney, built in 1918 ...

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