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mezzotint

(Encyclopedia)mezzotint mĕtˈsətĭnt, mĕdˈzə–, mĕzˈə– [key] [Ital.,=halftint], method of copper or steel engraving in tone. A Dutch officer, Ludwig von Siegen, is given credit for the invention of mezzo...

Logan, Sir William Edmond

(Encyclopedia)Logan, Sir William Edmond, 1798–1875, Canadian geologist. Educated in England, he managed (1831–38) coal mines and a copper smelter in Wales. In addition to making studies of clays underlying coal...

niello

(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 ...

Nakhon Ratchasima

(Encyclopedia)Nakhon Ratchasima kōrätˈ [key], city (1990 pop. 204,121), capital of Nakhon Ratchasima prov., S central Thailand, on the Mun River. Strategically located near the mountain pass leading from the cen...

Pechenga

(Encyclopedia)Pechenga pyĕˈchĭn-gə [key], Finnish Petsamo, town, NW European Russia, an ice-free port at the head of Pechenga Fjord on the Barents Sea and near the Norwegian border. It is also the northern term...

photoengraving

(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...

Cajamarca

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

Buell, Abel

(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 ...

turquoise

(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; ...

Puerto Cabello

(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...