Found 2 items, similar to Crown glass.
English → English (WordNet) Definition: crown glass crown glass n 1: a glass blown into a globe which is later flattened and spun to form a disk 2: optical glass of low dispersion and low refractive index [syn: optical crown]
English → English (gcide) Definition: 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] 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. Cornice, Corona, Coroner, Coronet.] 1. A wreath or garland, or any ornamental fillet encircling the head, especially as a reward of victory or mark of honorable distinction; hence, anything given on account of, or obtained by, faithful or successful effort; a reward. “An olive branch and laurel crown.” --Shak. [1913 Webster] They do it to obtain a corruptible crown; but we an incorruptible. --1 Cor. ix. 25. [1913 Webster] Be thou faithful unto death, and I will give thee a crown of life. --Rev. ii. 10. [1913 Webster] 2. A royal headdress or cap of sovereignty, worn by emperors, kings, princes, etc. [1913 Webster] Note: Nobles wear coronets; the triple crown of the pope is usually called a tiara. The crown of England is a circle of gold with crosses, fleurs-de-lis, and imperial arches, inclosing a crimson velvet cap, and ornamented with thousands of diamonds and precious stones. [1913 Webster] 3. The person entitled to wear a regal or imperial crown; the sovereign; -- with the definite article. [1913 Webster] Parliament may be dissolved by the demise of the crown. --Blackstone. [1913 Webster] Large arrears of pay were due to the civil and military servants of the crown. --Macaulay. [1913 Webster] 4. Imperial or regal power or dominion; sovereignty. [1913 Webster] There is a power behind the crown greater than the crown itself. --Junius. [1913 Webster] 5. Anything which imparts beauty, splendor, honor, dignity, or finish. [1913 Webster] The hoary head is a crown of glory, if it be found in the way of righteousness. --Prov. xvi. 31. [1913 Webster] A virtuous woman is a crown to her husband. --Prov. xvi. 4. [1913 Webster] 6. Highest state; acme; consummation; perfection. [1913 Webster] Mutual love, the crown of all our bliss. --Milton. [1913 Webster] 7. The topmost part of anything; the summit. [1913 Webster] The steepy crown of the bare mountains. --Dryden. [1913 Webster] 8. The topmost part of the head (see Illust. of Bird.); that part of the head from which the hair descends toward the sides and back; also, the head or brain. [1913 Webster] From toe to crown he'll fill our skin with pinches. --Shak. [1913 Webster] Twenty things which I set down: This done, I twenty more-had in my crown. --Bunyan. [1913 Webster] 9. The part of a hat above the brim. [1913 Webster] 10. (Anat.) The part of a tooth which projects above the gum; also, the top or grinding surface of a tooth. [1913 Webster] 11. (Arch.) The vertex or top of an arch; -- applied generally to about one third of the curve, but in a pointed arch to the apex only. [1913 Webster] 12. (Bot.) Same as Corona. [1913 Webster] 13. (Naut.) (a) That part of an anchor where the arms are joined to the shank. (b) The rounding, or rounded part, of the deck from a level line. (c) pl. The bights formed by the several turns of a cable. --Totten. [1913 Webster] 14. The upper range of facets in a rose diamond. [1913 Webster] 15. The dome of a furnace. [1913 Webster] 16. (Geom.) The area inclosed between two concentric perimeters. [1913 Webster] 17. (Eccl.) A round spot shaved clean on the top of the head, as a mark of the clerical state; the tonsure. [1913 Webster] 18. A size of writing paper. See under Paper. [1913 Webster] 19. A coin stamped with the image of a crown; hence,a denomination of money; as, the English crown, a silver coin of the value of five shillings sterling, or a little more than $1.20; the Danish or Norwegian crown, a money of account, etc., worth nearly twenty-seven cents. [1913 Webster] 20. An ornaments or decoration representing a crown; as, the paper is stamped with a crown. [1913 Webster] Crown of aberration (Astron.), a spurious circle around the true circle of the sun. Crown antler (Zo["o]l.), the topmost branch or tine of an antler; also, an antler having a cuplike top, with tines springing from the rim. Crown bar, one of the bars which support the crown sheet of steam-boiler furnace. Crown glass. See under Glass. Crown imperial. (Bot.) See in the Vocabulary. Crown jewels, the jewels appertaining to the sovereign while wearing the crown. [Eng.] “She pawned and set to sale the crown jewels.” --Milton. Crown land, land belonging to the crown, that is, to the sovereign. Crown law, the law which governs criminal prosecutions. [Eng.] Crown lawyer, one employed by the crown, as in criminal cases. [Eng.] Crown octavo. See under Paper. Crown office. See in the Vocabulary. Crown paper. See under Paper. Crown piece. See in the Vocabulary. Crown Prince, the heir apparent to a crown or throne. Crown saw. See in the Vocabulary. Crown scab (Far.), a cancerous sore formed round the corners of a horse's hoof. Crown sheet, the flat plate which forms the top of the furnace or fire box of an internally fired steam boiler. Crown shell. (Zo["o]l.) See Acorn-shell. Crown side. See Crown office. Crown tax (Eccl. Hist.), a golden crown, or its value, which was required annually from the Jews by the king of Syria, in the time of the Maccabees. --1 Macc. x. 20. Crown wheel. See in the Vocabulary. Crown work. See in the Vocabulary. Pleas of the crown (Engl. law), criminal actions. [1913 Webster]