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2. Leviton - Wikipedia

   en.wikipedia.org/wiki/Leviton

   Leviton Manufacturing Company, Inc. is an American manufacturer of electrical wiring equipment in North America. It produces electrical light sockets, receptacles and outlets, switches, dimmers and other lighting control systems, wire, power cables, power cords, wall and ceiling occupancy sensors, wall plates, datacom, and other electrical products.

3. Time switch - Wikipedia

   en.wikipedia.org/wiki/Time_switch

   A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer . Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall lights, stokers, and oil and gas burners." A consumer version was added in 1952.

4. Joel Spira (businessman) - Wikipedia

   en.wikipedia.org/wiki/Joel_Spira_(businessman)

   Known for. invention of the first solid state-electronic dimmer and founder of Lutron Electronics Company. Joel Solon Spira (March 1, 1927 – April 8, 2015) was an American inventor, entrepreneur, and business magnate . He invented a version of the light- dimmer switch for use in homes around the United States and led his Lutron Electronics ...

5. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   Vintage push-button light switches. The push-button light switch has two buttons: one that closes the contacts and one that opens the contacts. Pushing the raised button opens or closes the contacts and pops out the previously depressed button so the process can be reversed. In the U.S., the buttons were commonly black; the "on" button ...

6. History of timekeeping devices - Wikipedia

   en.wikipedia.org/wiki/History_of_timekeeping_devices

   History of timekeeping devices. A marine sandglass. It is related to the hourglass, nowadays often used symbolically to represent the concept of time. The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky. Devices and methods for keeping time have gradually ...

7. Levitation (physics) - Wikipedia

   en.wikipedia.org/wiki/Levitation_(physics)

   Levitation (physics) Levitation (from Latin levitas, lit. 'lightness') [1] is the process by which an object is held aloft in a stable position, without mechanical support via any physical contact. Levitation is accomplished by providing an upward force that counteracts the pull of gravity (in relation to gravity on earth), plus a smaller ...