mercury discharge lamp
81rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …
82Wagon-wheel effect — The wagon wheel effect (alternatively, or stagecoach wheel effect, stroboscopic effect) is an optical illusion in which a spoked wheel appears to rotate differently from its true rotation. The wheel can appear to rotate more slowly than the true… …
83Total organic carbon — (TOC) is the amount of carbon bound in an organic compound and is often used as a non specific indicator of water quality or cleanliness of pharmaceutical manufacturing equipment. A typical analysis for TOC measures both the total carbon present… …
84Ashok Gadgil — (born 1950 in India) works with Lawrence Berkeley National Laboratory in Berkeley. He is best known for UV Waterworks a simple, effective and inexpensive water disinfection system.UV Waterworks uses the UV light emitted by a low pressure mercury… …
85Cooper Hewitt — can refer to: Peter Cooper Hewitt, inventor of the mercury vapor discharge lamp. Cooper Hewitt, National Design Museum, a museum of the Smithsonian Institution dedicated to design. This disambiguation page lists articles associated with the same… …
86lighting — /luy ting/, n. 1. the act of igniting or illuminating: the lighting of many candles; the annual lighting of the Christmas tree. 2. the arrangement of lights to achieve particular effects: to work out the lighting for one s living room. 3. an… …
87Headlamp — Headlight redirects here. For other uses, see Headlight (disambiguation). High Beams redirects here. For the urban legend also known by that name, see Killer in the backseat. A motor scooter s front with an impractical number and variety of… …
88Neon lighting — Times Square, New York City, has been famous for elaborate neon lighting displays since th …
89Lighting — Not to be confused with lightning. For other uses, see lighting (disambiguation). Low intensity lighting and haze in a concert hall allows laser effects to be visible …
90Light-emitting diode — LED redirects here. For other uses, see LED (disambiguation). Light emitting diode Red, pure green and blue LEDs of the 5mm diffused type Type Passive, optoelectronic Working principle Electr …
