Columbia Encyclopedia

(Encyclopedia) niello nēĕlˈō [key] [Ital. from Latin nigellus=blackish], black metallic alloy of sulfur, copper, silver, and usually lead, used as an inlay on engraved metal. The metal surface is brushed with a ...

(Encyclopedia) photoengraving, photomechanical process in the graphic arts, used principally for reproducing illustrations. The subject is photographed, and the image is recorded on a sensitized metal plate, which i...

(Encyclopedia) Brill or Bril, Flemish painters, brothers. Mattys Brill mäˈtīs [key], 1550–83, went to Rome early in his career and executed frescoes for Gregory XIII in the Vatican. Paul Brill, 1554–1626, pro...

(Encyclopedia) repoussé rəpo͞osāˈ [key], the process or the product of ornamenting metallic surfaces with designs in relief hammered out from the back by hand. Gold and silver are most commonly used today for f...

(Encyclopedia) Diyarbakir dēyärˈbäkŭrˌ [key], anc. Amida, city, capital of Diyarbakir prov., SE Turkey...

(Encyclopedia) Cajamarca kähämärˈkä [key], city, capital of Cajamarca prov., N Peru. An important commercial ...

(Encyclopedia) Puerto Cabello käbāˈyō [key], city (1990 pop. 128,825), N Venezuela, a port on the Caribbean Sea. An important Venezuelan port, it ships meat, coffee, cacao, dyewoods, and copper ores. Near the ci...

(Encyclopedia) turquoise, hydrous phosphate of aluminum and copper, Al2(OH)3PO4·H2O+Cu, used as a gem. It occurs rarely in crystal form, but is usually cryptocrystalline. Turquoise is opaque and has a waxy luster; ...

(Encyclopedia) Buell, Abel byo͞oˈəl [key], 1742–1822, American silversmith, engraver, and type founder, b. Killingworth, Conn. He engraved a number of maps, including maps of the Florida coast and a large wall ...

(Encyclopedia) Guericke, Otto von ôˈtō fən gāˈrĭkə [key], 1602–86, German physicist, noted for his study of pneumatics. He carried out his most important researches while burgomaster (1646–81) of Magdebu...