Crown glass

Crown glass
Glass Glass (gl[.a]s), n. [OE. glas, gles, AS. gl[ae]s; akin to D., G., Dan., & Sw. glas, Icel. glas, gler, Dan. glar; cf. AS. gl[ae]r amber, L. glaesum. Cf. {Glare}, n., {Glaze}, v. t.] [1913 Webster] 1. A hard, brittle, translucent, and commonly transparent substance, white or colored, having a conchoidal fracture, and made by fusing together sand or silica with lime, potash, soda, or lead oxide. It is used for window panes and mirrors, for articles of table and culinary use, for lenses, and various articles of ornament. [1913 Webster]

Note: Glass is variously colored by the metallic oxides; thus, manganese colors it violet; copper (cuprous), red, or (cupric) green; cobalt, blue; uranium, yellowish green or canary yellow; iron, green or brown; gold, purple or red; tin, opaque white; chromium, emerald green; antimony, yellow. [1913 Webster]

2. (Chem.) Any substance having a peculiar glassy appearance, and a conchoidal fracture, and usually produced by fusion. [1913 Webster]

3. Anything made of glass. Especially: (a) A looking-glass; a mirror. (b) A vessel filled with running sand for measuring time; an hourglass; and hence, the time in which such a vessel is exhausted of its sand. [1913 Webster]

She would not live The running of one glass. --Shak. (c) A drinking vessel; a tumbler; a goblet; hence, the contents of such a vessel; especially; spirituous liquors; as, he took a glass at dinner. (d) An optical glass; a lens; a spyglass; -- in the plural, spectacles; as, a pair of glasses; he wears glasses. (e) A weatherglass; a barometer. [1913 Webster]

Note: Glass is much used adjectively or in combination; as, glass maker, or glassmaker; glass making or glassmaking; glass blower or glassblower, etc. [1913 Webster]

{Bohemian glass}, {Cut glass}, etc. See under {Bohemian}, {Cut}, etc.

{Crown glass}, a variety of glass, used for making the finest plate or window glass, and consisting essentially of silicate of soda or potash and lime, with no admixture of lead; the convex half of an achromatic lens is composed of crown glass; -- so called from a crownlike shape given it in the process of blowing.

{Crystal glass}, or {Flint glass}. See {Flint glass}, in the Vocabulary.

{Cylinder glass}, sheet glass made by blowing the glass in the form of a cylinder which is then split longitudinally, opened out, and flattened.

{Glass of antimony}, a vitreous oxide of antimony mixed with sulphide.

{Glass cloth}, a woven fabric formed of glass fibers.

{Glass coach}, a coach superior to a hackney-coach, hired for the day, or any short period, as a private carriage; -- so called because originally private carriages alone had glass windows. [Eng.] --Smart. [1913 Webster]

Glass coaches are [allowed in English parks from which ordinary hacks are excluded], meaning by this term, which is never used in America, hired carriages that do not go on stands. --J. F. Cooper.

{Glass cutter}. (a) One who cuts sheets of glass into sizes for window panes, ets. (b) One who shapes the surface of glass by grinding and polishing. (c) A tool, usually with a diamond at the point, for cutting glass.

{Glass cutting}. (a) The act or process of dividing glass, as sheets of glass into panes with a diamond. (b) The act or process of shaping the surface of glass by appylying it to revolving wheels, upon which sand, emery, and, afterwards, polishing powder, are applied; especially of glass which is shaped into facets, tooth ornaments, and the like. Glass having ornamental scrolls, etc., cut upon it, is said to be engraved.

{Glass metal}, the fused material for making glass.

{Glass painting}, the art or process of producing decorative effects in glass by painting it with enamel colors and combining the pieces together with slender sash bars of lead or other metal. In common parlance, glass painting and glass staining (see {Glass staining}, below) are used indifferently for all colored decorative work in windows, and the like.

{Glass paper}, paper faced with pulvirezed glass, and used for abrasive purposes.

{Glass silk}, fine threads of glass, wound, when in fusion, on rapidly rotating heated cylinders.

{Glass silvering}, the process of transforming plate glass into mirrors by coating it with a reflecting surface, a deposit of silver, or a mercury amalgam.

{Glass soap}, or {Glassmaker's soap}, the black oxide of manganese or other substances used by glass makers to take away color from the materials for glass.

{Glass staining}, the art or practice of coloring glass in its whole substance, or, in the case of certain colors, in a superficial film only; also, decorative work in glass. Cf. Glass painting.

{Glass tears}. See {Rupert's drop}.

{Glass works}, an establishment where glass is made.

{Heavy glass}, a heavy optical glass, consisting essentially of a borosilicate of potash.

{Millefiore glass}. See {Millefiore}.

{Plate glass}, a fine kind of glass, cast in thick plates, and flattened by heavy rollers, -- used for mirrors and the best windows.

{Pressed glass}, glass articles formed in molds by pressure when hot.

{Soluble glass} (Chem.), a silicate of sodium or potassium, found in commerce as a white, glassy mass, a stony powder, or dissolved as a viscous, sirupy liquid; -- used for rendering fabrics incombustible, for hardening artificial stone, etc.; -- called also {water glass}.

{Spun glass}, glass drawn into a thread while liquid.

{Toughened glass}, {Tempered glass}, glass finely tempered or annealed, by a peculiar method of sudden cooling by plunging while hot into oil, melted wax, or paraffine, etc.; -- called also, from the name of the inventor of the process, {Bastie glass}.

{Water glass}. (Chem.) See {Soluble glass}, above.

{Window glass}, glass in panes suitable for windows. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • crown-glass — [ kronglas ] n. m. inv. • 1764; mots angl. « verre de couronne » ♦ Opt. Verre très transparent et peu dispersif servant à faire des lentilles d optique. ⇒CROWN GLASS, subst. masc. Verre blanc de qualité supérieure, employé pour la fabrication de… …   Encyclopédie Universelle

  • Crown glass — Crown Crown (kroun), n. [OE. corone, coroun, crune, croun, OF. corone, corune, F. couronne, fr. L. corona crown, wreath; akin to Gr. korw nh anything curved, crown; cf. also L. curvus curved, E. curve, curb, Gael. cruinn round, W. crwn. Cf.… …   The Collaborative International Dictionary of English

  • Crown glass — is either of two kinds of glass: Crown glass (window) was a type of hand blown window glass. Crown glass (optics) is a type of optical glass used in lenses. This disambiguation page lists articles associated with the same title. If an …   Wikipedia

  • crown glass — crown′ glass n. 1) opt cer an optical glass of low dispersion and generally low index of refraction 2) cer an old form of window glass formed by blowing a globe and whirling it into a disk • Etymology: 1700–10 …   From formal English to slang

  • crown glass — n. 1. window glass made in flat, circular plates by blowing and whirling, with a small knot in the center left by the blower s rod 2. a very clear optical glass with a low index of refraction …   English World dictionary

  • crown glass — 1. an optical glass of low dispersion and generally low index of refraction. 2. an old form of window glass formed by blowing a globe and whirling it into a disk. [1700 10] * * *       handmade glass of soda lime composition for domestic glazing… …   Universalium

  • crown glass — noun 1. a glass blown into a globe which is later flattened and spun to form a disk • Hypernyms: ↑glass 2. optical glass of low dispersion and low refractive index • Syn: ↑optical crown, ↑optical crown glass • Hypernyms: ↑optical glass …   Useful english dictionary

  • crown-glass — (krôn glas ) s. m. Espèce de verre constitué par 1 atome quadrisilicate de potasse et 1 atome quadrisilicate de chaux. C est un verre blanc de la plus belle qualité, qui est employé dans les lunettes achromatiques. ÉTYMOLOGIE    Angl. crown glass …   Dictionnaire de la Langue Française d'Émile Littré

  • crown glass — kronas statusas T sritis chemija apibrėžtis Optinis stiklas, turintis didelį lūžio rodiklį ir nedidelę sklaidą. atitikmenys: angl. crown glass rus. крон …   Chemijos terminų aiškinamasis žodynas

  • Crown glass (optics) — This article is about crown glass as used in optics. For the window glass, see Crown glass (window). Crown glass is type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low… …   Wikipedia

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