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  2. Kõpu Lighthouse - Wikipedia

    en.wikipedia.org/wiki/Kõpu_Lighthouse

    A new light system was bought at the 1900 Paris World Fair, for three million gold rubles. The new apparatus (including the light chamber) was made by Sautter, Marlé & Co. [13] It used a kerosene lamp with an incandescent mantle. [10] A heavy cast iron system floated and rotated in a bath of mercury, which acted as a bearing. The bath ...

  3. Caloundra Lighthouses - Wikipedia

    en.wikipedia.org/wiki/Caloundra_Lighthouses

    For the greater part of World War II the Royal Australian Navy set up an observation post within the grounds of the Caloundra Head Lighthouse reserve. Twenty-four hour watches were kept, and display of the light to shipping was controlled. The light was converted to 240 volt mains power in 1942 and a petrol standby engine was added.

  4. Light pillar - Wikipedia

    en.wikipedia.org/wiki/Light_pillar

    A light pillar or ice pillar is an atmospheric optical phenomenon in which a vertical beam of light appears to extend above and/or below a light source. The effect is created by the reflection of light from tiny ice crystals that are suspended in the atmosphere or that comprise high-altitude clouds (e.g. cirrostratus or cirrus clouds). [1]

  5. Mains electricity - Wikipedia

    en.wikipedia.org/wiki/Mains_electricity

    Mains electricity, utility power, grid power, domestic power, wall power, household current, [2] or, in some parts of Canada, hydro, is a general-purpose alternating-current (AC) electric power supply. It is the form of electrical power that is delivered to homes and businesses through the electrical grid in many parts of the world. People use ...

  6. Parabolic aluminized reflector - Wikipedia

    en.wikipedia.org/wiki/Parabolic_aluminized_reflector

    Usage includes theatrical lighting, locomotive headlamps, aircraft landing lights, and residential and commercial recessed lights ("cans" in the United States). Many PAR lamps are of the sealed beam variety, with a parabolic reflector , one or more filaments , and a glass or plastic lens sealed permanently together as a unit.

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