quartz light

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• Quartz-porphyry — Quartz porphyry, in petrology, is the name given to a group of hemi crystalline acid rocks containing porphyritic crystals of quartz in a fine grained matrix, usually of micro crystalline or felsitic structure. In specimens, the quartz appears as …   Wikipedia

• quartz-halogen lamp — quartz lamp, quartz halogen lamp or quartz iodine lamp noun A compact source of light used for high intensity floodlighting of large areas, in car (fog )lamps, cine projectors, etc • • • Main Entry: ↑quartz …   Useful english dictionary

• quartz lamp — quartz′ lamp′ n. opt a lamp consisting of an ultraviolet light source, as mercury vapor, contained in a fused silica bulb that transmits ultraviolet light with little absorption • Etymology: 1920–25 …   From formal English to slang

• Quartz clock — A quartz clock is a clock that uses an electronic oscillator that is regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks are at least an order of magnitude more… …   Wikipedia

• Quartz — This article is about the mineral. For other uses, see Quartz (disambiguation). Quartz Quartz crystal cluster from Tibet General Category …   Wikipedia

• quartz lamp — noun a mercury vapor lamp that is enclosed in a quartz container instead of a glass container • Hypernyms: ↑mercury vapor lamp * * * noun : a mercury vapor lamp in a tube of quartz glass that transmits most of the ultraviolet radiation * * * a… …   Useful english dictionary

• quartz — quartzose /kwawrt sohs/, quartzous /kwawrt seuhs/, adj. /kwawrts/, n. one of the commonest minerals, silicon dioxide, SiO2, having many varieties that differ in color, luster, etc., and occurring either in masses (as agate, bloodstone, chalcedony …   Universalium

• Light-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 …   Wikipedia

• quartz-halogen bulb — A bulb with an inner quartz bulb which holds a tungsten filament. Usually the inner bulb contains an inert gas such as iodine or one of the other five halogen gases. The use of a halogen gas prevents the bulb from turning black and thus reducing… …   Dictionary of automotive terms

• quartz-iodine lamp — ¦ ̷ ̷ ¦ ̷ ̷  ̷ ̷  ̷ ̷ noun : an incandescent lamp that has a quartz bulb and a tungsten filament and that contains iodine which reacts with the vaporized tungsten to prevent excessive blackening of the bulb * * * quartz lamp, quartz halogen lamp… …   Useful english dictionary

• quartz — n. a mineral form of silica that crystallizes as hexagonal prisms. Phrases and idioms: quartz clock a clock operated by vibrations of an electrically driven quartz crystal. quartz lamp a quartz tube containing mercury vapour and used as a light… …   Useful english dictionary