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2. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location.A common application is in lighting, where it allows the control of lamps from multiple locations, for example in a hallway, stairwell, or large room.

3. 3-way lamp - Wikipedia

   en.wikipedia.org/wiki/3-way_lamp

   A 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. In 3-way incandescent light bulbs, each of the filaments operates at full voltage. Lamp bulbs with dual carbon filaments were ...

4. File:3 way switch right.svg - Wikipedia

   en.wikipedia.org/wiki/File:3_way_switch_right.svg

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

5. Wiring diagram - Wikipedia

   en.wikipedia.org/wiki/Wiring_diagram

   An automotive wiring diagram, showing useful information such as crimp connection locations and wire colors. These details may not be so easily found on a more schematic drawing. A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the ...

6. File:California-3-way.svg - Wikipedia

   en.wikipedia.org/wiki/File:California-3-way.svg

   English: "California" 3-way switch. Alternative to the conventional connection for a three-way switch. The lamp shell is never connected to the live terminal. A second lamp can be connected at A to light the end of a long corridor or as a pilot lamp to indicate the light in an outbuilding is left on.

7. Knob-and-tube wiring - Wikipedia

   en.wikipedia.org/wiki/Knob-and-tube_wiring

   Compared to modern electrical wiring standards, these are the main technical shortcomings of knob-and-tube wiring methods: never included a safety grounding conductor; did not confine switching to the hot conductor (the so-called Carter system prohibited as of 1923 places electrical loads across the common terminals of a three-way switch pair)

8. Mercury switch - Wikipedia

   en.wikipedia.org/wiki/Mercury_switch

   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 designs (tilt, displacement, radial, etc.) but they all share the common design strength of non-eroding switch contacts.

9. John Henry Holmes - Wikipedia

   en.wikipedia.org/wiki/John_Henry_Holmes

   Developing technology behind the modern light switch John Henry Holmes (1857 – 1935) was an English electrical engineer , inventor, Quaker and pioneer of electric lighting who invented the quick break light switch, the technology behind which remains the basis for modern wall mounted light switches .