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  2. Time switch - Wikipedia

    en.wikipedia.org/wiki/Time_switch

    The timer may switch equipment on, off, or both, at a preset time or times, after a preset interval, or cyclically. A countdown time switch switches power, usually off, after a preset time. A cyclical timer switches equipment both on and off at preset times over a period, then repeats the cycle; the period is usually 24 hours or 7 days.

  3. Leviton - Wikipedia

    en.wikipedia.org/wiki/Leviton

    Leviton was founded in 1906 by Russian immigrants Evser Leviton and his son Isidor Leviton when they began manufacturing brass mantle tips for natural gas lights in Manhattan's Lower East Side. [ 2 ] [ 3 ] [ 4 ] In 1910, Isidor designed a screw-in lampholder for the newly invented electric light bulb and within ten years the lampholders were ...

  4. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]

  5. Mercury switch - Wikipedia

    en.wikipedia.org/wiki/Mercury_switch

    A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit.

  6. Timer - Wikipedia

    en.wikipedia.org/wiki/Timer

    Mechanical timers use clockwork to measure time. [1] Manual timers are typically set by turning a dial to the time interval desired, turning the dial stores energy in a mainspring to run the mechanism. They function similarly to a mechanical alarm clock, the energy in the mainspring causes a balance wheel to rotate back and forth. Each swing of ...

  7. Israeli military kills four doctors in raid on Kamal Adwan ...

    www.aol.com/israeli-military-kills-four-doctors...

    Four doctors were killed at the Kamal Adwan Hospital in besieged northern Gaza on Friday, after Israeli forces stormed the compound, killing and injuring dozens of people in areas surrounding the ...

  8. Powerful thunderstorms batter parts of Texas, threatening ...

    www.aol.com/storms-tornadoes-bad-weather...

    Parts of Texas and Louisiana were under a tornado watch Thursday night as a line of thunderstorms battered the south-central U.S., threatening the region with large hail, damaging winds and heavy ...

  9. Quartz clock - Wikipedia

    en.wikipedia.org/wiki/Quartz_clock

    A quartz clock hung on a wall, 2005. ... By the 1980s, quartz technology had taken over applications such as kitchen timers, alarm clocks, bank vault time locks, ...

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