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  2. Earthing system - Wikipedia

    en.wikipedia.org/wiki/Earthing_system

    The TT (French: terre–terre) earthing system In a TT (Latin: terra–terra) earthing system, the protective earth connection for the consumer is provided by a local earth electrode, (sometimes referred to as the terra firma connection) and there is another independently installed at the generator.

  3. Return connecting rod engine - Wikipedia

    en.wikipedia.org/wiki/Return_connecting_rod_engine

    A return connecting rod, [1] [2] return piston rod [i] or (in marine parlance) double piston rod engine [2] or back-acting engine is a particular layout for a steam engine. The key attribute of this layout is that the piston rod emerges from the cylinder to the crosshead , but the connecting rod then reverses direction and goes backwards to the ...

  4. Branched covering - Wikipedia

    en.wikipedia.org/wiki/Branched_covering

    The projection of C onto the x-axis is a ramified cover with ramification locus given by x ( x − 1 ) ( x − 2 ) = 0. {\displaystyle x(x-1)(x-2)=0.} This is because for these three values of x the fiber is the double point y 2 = 0 , {\displaystyle y^{2}=0,} while for any other value of x , the fiber consists of two distinct points (over an ...

  5. Multiview orthographic projection - Wikipedia

    en.wikipedia.org/wiki/Multiview_orthographic...

    Comparison of several types of graphical projection, including elevation and plan views. To render each such picture, a ray of sight (also called a projection line, projection ray or line of sight) towards the object is chosen, which determines on the object various points of interest (for instance, the points that are visible when looking at the object along the ray of sight); those points of ...

  6. Tunnel - Wikipedia

    en.wikipedia.org/wiki/Tunnel

    Cut-and-cover construction at Saint-Michel on Paris Métro Line 4 (c. 1910) Cut-and-cover is a simple method of construction for shallow tunnels where a trench is excavated and roofed over with an overhead support system strong enough to carry the load of what is to be built above the tunnel. [29] There are two basic forms of cut-and-cover ...

  7. Cathodic protection - Wikipedia

    en.wikipedia.org/wiki/Cathodic_protection

    Marine cathodic protection covers many areas, jetties, harbors, offshore structures. The variety of different types of structure leads to a variety of systems to provide protection. Galvanic anodes are favored, [28] but ICCP can also often be used. Because of the wide variety of structure geometry, composition, and architecture, specialized ...

  8. Panhard EBR - Wikipedia

    en.wikipedia.org/wiki/Panhard_EBR

    It is a particular trait of French reconnaissance vehicles to be heavily armed. From the prewar MD 178 armed with an anti-tank gun of 25 mm, (which was for the period a significant caliber for such a small vehicle) to the direct successor of the EBR, the AMX-10RC , also used for wheeled reconnaissance, and armed with a powerful 105 mm gun with ...

  9. Wikipedia:Vital articles/Level/5/Technology - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Vital_articles/...

    Vital articles is a list of subjects for which Wikipedia should have corresponding high-quality articles. It serves as a centralized watchlist to track the status of Wikipedia's most essential articles.

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