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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 switches is regulated by some authority concerned with safety and standards. In different countries the standard dimensions of the wall mounting hardware (boxes, plates, etc.) may differ.
The light installation consisted of water and light was exhibited at a town centre art gallery. [17] Also there was the United Kingdom's first Illuminated Art Car Parade on 21 October [18] [19] as well as the return of the Honda Goldwing Light Parade. [12]
A dive light is routinely used during night dives and cave dives, when there is little or no natural light, but also has a useful function during the day, as water absorbs the longer (red) wavelengths first then the yellow and green with increasing depth. By using artificial light, it is possible to view an object in full color at greater depths.
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.
A wide variety of mechanical switch designs using slide switches, rocker switches, or side-mounted or end-mounted pushbuttons has been used in flashlights. A common combination is a slide switch that allows the light to be left on for an extended time, combined with a momentary button for intermittent use or signalling.
A major benefit of lighting control systems is reduced energy consumption. Longer lamp life is also gained when dimming and switching off lights when not in use. Wireless lighting control systems provide additional benefits including reduced installation costs and increased flexibility over where switches and sensors may be placed. [3]
A water lantern is a type of lamp that floats on the surface of the water. It is also known as a floating lamp , river lamp or lake lamp , depending on the water body on which it is floated. The water lantern originated in India and later spread to other parts of South Asia, Southeast Asia and East Asia due to the influence of Hindu-Buddhist ...
Gasoline on water shows a pattern of bright and dark fringes when illuminated with 589nm laser light. Where incident light is monochromatic in nature, interference patterns appear as light and dark bands. Light bands correspond to regions at which constructive interference is occurring between the reflected waves and dark bands correspond to ...