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  2. T5 retrofit conversion - Wikipedia

    en.wikipedia.org/wiki/T5_retrofit_conversion

    T5 retrofit conversion can maintain existing lighting levels with the higher efficiency of the T5 lamp. However, with kits that operates the lamp on the existing magnetic ballast, the efficiency drops and the lamp life is considerably shortened, as T5 lamps aren't designed to be operated on mains frequency but only on high frequency.

  3. Lightning rod - Wikipedia

    en.wikipedia.org/wiki/Lightning_rod

    The first proper lightning rod was invented by Father Prokop Diviš, a Czech priest and scientist, who erected a grounded lightning rod in 1754. Diviš's design involved a vertical iron rod topped with a grounded wire, intended to attract lightning strikes and safely conduct them to the ground. [2]

  4. Galvanization - Wikipedia

    en.wikipedia.org/wiki/Galvanization

    Galvanized surface with visible spangle Galvanization ( also spelled galvanisation ) [ 1 ] is the process of applying a protective zinc coating to steel or iron , to prevent rusting . The most common method is hot-dip galvanizing , in which the parts are coated by submerging them in a bath of hot, molten zinc.

  5. Lamp box - Wikipedia

    en.wikipedia.org/wiki/Lamp_box

    Lamp boxes are the smallest of the post boxes used by the Royal Mail in the UK, by its counterparts in the Commonwealth of Nations and also by An Post in Ireland. Their name derives from the fact that they were designed to be affixed to lamp posts , [ 1 ] although they may equally be found embedded in walls or mounted on poles.

  6. Hot-dip galvanization - Wikipedia

    en.wikipedia.org/wiki/Hot-dip_galvanization

    Galvanised hand rail Crystalline surface of a hot-dip galvanized handrail, known as "spangle" Protective effect: completely rusted letter box mounted to a hot-dip galvanized wall Steel strip coming out of the zinc pot of a continuous vertical hot-dip galvanizing line. Hot-dip galvanization is a form of galvanization.

  7. Cathodic protection - Wikipedia

    en.wikipedia.org/wiki/Cathodic_protection

    Aluminum sacrificial anodes (light colored rectangular bars) mounted on a steel jacket structure. Zinc sacrificial anode (rounded object) screwed to the underside of the hull of a small boat. Cathodic protection (CP; / k æ ˈ θ ɒ d ɪ k / ⓘ) is a technique used to control the corrosion of a metal surface by making it the cathode of an ...

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