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  2. Limit switch - Wikipedia

    en.wikipedia.org/wiki/Limit_switch

    A limit switch with a roller-lever operator; this is installed on a gate on a canal lock, and indicates the position of a gate to a control system A limit switch mounted on a moving part of a bridge In electrical engineering , a limit switch is a switch operated by the motion of a machine part or the presence of an object.

  3. Bang–bang control - Wikipedia

    en.wikipedia.org/wiki/Bang–bang_control

    In control theory, a bang–bang controller (hysteresis, 2 step or on–off controller), is a feedback controller that switches abruptly between two states. These controllers may be realized in terms of any element that provides hysteresis. They are often used to control a plant that accepts a binary input, for example a furnace that is either ...

  4. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    After the control of air flow and temperature was standardized, the use of electromechanical relays in ladder logic to switch dampers became standardized. Eventually, the relays became electronic switches, as transistors eventually could handle greater current loads. By 1985, pneumatic controls could no longer compete with this new technology ...

  5. Thermal cutoff - Wikipedia

    en.wikipedia.org/wiki/Thermal_cutoff

    A thermal switch (sometimes thermal reset or thermal cutout (TCO)) is a device which normally opens at a high temperature (often with a faint "plink" sound) and re-closes when the temperature drops. The thermal switch may be a bimetallic strip, often encased in a tubular glass bulb to protect it from dust or short circuit. Another common design ...

  6. The boy was found in a ditch in Wisconsin in 1959. He was ...

    www.aol.com/boy-found-ditch-wisconsin-1959...

    Officials in in Wisconsin said DNA evidence has solved a more than 65-year-old cold case involving missing 7-year-old Michigan boy Markku Jutila, born as Chester Breiney. The Ozaukee County ...

  7. The 7 Discontinued Items From McDonald’s That We Miss the Most

    www.aol.com/lifestyle/7-discontinued-items...

    There are currently 13,544 McDonald’s locations in the United States.. That makes it the third largest restaurant chain in the country — following Subway and Starbucks with 20,325 and 15,988 ...

  8. 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. There are several different basic ...

  9. What Elphaba’s costume has to do with mushrooms, and more ...

    www.aol.com/elphaba-costume-mushrooms-more...

    “Wicked” costume designer Paul Tazewell opens up about the making of Elphaba and Glinda's costumes on Wicked — the meaning of the Elphaba's back outfits, the bubble dress and more.

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