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2. 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 ...

3. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   The "California 3-way" or "Coast 3-way" connection never connects the lamp socket shell to the line (hot) terminal. An optional additional lamp can be connected at Terminal A as a pilot lamp, or to illuminate a long corridor. An optional receptacle can be connected at Terminal B, since that terminal is always live.

4. History of AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/History_of_AC_power_plugs...

   Gradually wall sockets were developed to supplement those that screwed into lampholders. [5] [6] [7] In 1912 Hubbell rotated his tandem pins by 90 degrees to arrive at the parallel flat pin configuration still widely used today (NEMA 1-15). A feature common to all of Hubbell's patented designs is the provision of detents to retain a plug in its ...

5. Lightbulb socket - Wikipedia

   en.wikipedia.org/wiki/Lightbulb_socket

   E39d Three-way Mogul (modified socket with additional ring contact for 3-way lamps) E40s European; Skirted (PAR-38) The light bulb commonly used since the early 20th century for general-purpose lighting applications, with a pear-like shape and an Edison screw base, is referred to as an "A-series light bulb." This most common general purpose ...

6. Edison screw - Wikipedia

   en.wikipedia.org/wiki/Edison_screw

   Three-way E26d light socket E26 Edison screw to NEMA 1-15 adapter. Specifications for all lamp mount types are defined in the following American National Standards Institute (ANSI) [12] and International Electrotechnical Commission (IEC) publications: Lamp Caps – ANSI C81.61 and IEC 60061-1; Lamp Holders – ANSI C81.62 and IEC 60061-2

7. Three-prong adaptor - Wikipedia

   en.wikipedia.org/wiki/Three-prong_adaptor

   Three-prong plugs do not fit into the older, two-prong receptacles. [7] When used as intended, the ground pin of the 3-wire receptacle is to be connected to a grounded cover screw, or to an external ground. In 1969, Underwriters Laboratories mandated three-prong plugs on major appliances for safety. [7]