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  2. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    In contrast to a simple light switch, which is a single pole, single throw (SPST) switch, multiway switching uses switches with one or more additional contacts and two or more wires are run between the switches. When the load is controlled from only two points, single pole, double throw (SPDT) switches are used.

  3. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    This "quick break" technology is still in use in almost every ordinary light switch in the world today, numbering in the billions, as well as in many other forms of electric switch. The toggle light switch was invented in 1916 by William J. Newton. [2] As a component of an electrical wiring or home wiring system, the installation of light ...

  4. Switch - Wikipedia

    en.wikipedia.org/wiki/Switch

    A switch may be directly manipulated by a human as a control signal to a system, such as a computer keyboard button, or to control power flow in a circuit, such as a light switch. Automatically operated switches can be used to control the motions of machines, for example, to indicate that a garage door has reached its full open position or that ...

  5. Double margin doors - Wikipedia

    en.wikipedia.org/wiki/Double_margin_doors

    Sample showing the parts of a double margin door. Peter Brett in his book Purpose Made Joinery describes this door as a pair of narrow doors joined at the meeting stile to make a single door with the appearance of a pair. [1] It is used for door openings that are too wide for a single door but where a pair of doors would be difficult for people ...

  6. Bi-pin lamp base - Wikipedia

    en.wikipedia.org/wiki/Bi-pin_lamp_base

    The suffix after the G indicates the pin spread; the G dates to the use of Glass for the original bulbs. GU usually also indicates that the lamp provides a mechanism for physical support by the luminaire: in some cases, each pin has a short section of larger diameter at the end (sometimes described as a "peg" rather than a "pin" [2]); the socket allows the bulb to lock into place by twisting ...

  7. SPDT - Wikipedia

    en.wikipedia.org/wiki/SPDT

    Single pole, double throw, a simple type of changeover electrical switch; Single Point Diamond Turning, a type of mechanical machining using diamond-tipped cutting elements; SCSI Pass-Through Direct, (SPTD) is a proprietary device driver and application programming interface (API)

  8. Knife switch - Wikipedia

    en.wikipedia.org/wiki/Knife_switch

    1917 motor switch, with extra contacts Dual-pole, dual-throw knife switch in one of its two closed positions. A knife switch is a type of switch used to control the flow of electricity in a circuit. It is composed of a hinge which allows a metal lever, or knife, to be lifted from or inserted into a slot or jaw.

  9. Double switch (baseball) - Wikipedia

    en.wikipedia.org/wiki/Double_switch_(baseball)

    In baseball, the double switch is a type of player substitution, usually performed by a team while playing defense. The double switch is typically used to make a pitching substitution, while simultaneously placing the incoming pitcher in a more favorable spot in the batting order than was occupied by the outgoing pitcher.

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