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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...

intaglio

(Encyclopedia)intaglio ĭntălˈyō, –tälˈ– [key], design cut into stone or other material or etched or engraved in a metal plate, producing a concave, instead of a convex, effect. It is the reverse of a reli...

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 ...

Niépce, Joseph Nicéphore

(Encyclopedia)Niépce, Joseph Nicéphore zhôzĕfˈ nēsāfôrˈ nyĕps [key], 1765–1833, French chemist who originated a process of photography (see photography, still). In 1826 he produced the first known photo...

willow-pattern ware

(Encyclopedia)willow-pattern ware, sometimes porcelain but frequently opaque pottery, originated in Staffordshire, England, c.1780. Thomas Minton (see Minton, family), then an apprentice potter, developed and engra...

slug

(Encyclopedia)slug, name for a terrestrial gastropod mollusk in which the characteristic molluscan shell is reduced to a thin plate embedded in the tissues. Like the terrestrial snails of the same order, slugs have...

spectroheliograph

(Encyclopedia)spectroheliograph, device for photographing the surface of the sun in a single wavelength of light, usually one corresponding to a chief element contained in the sun, e.g., hydrogen or calcium; the re...

Jeter, Derek Sanderson

(Encyclopedia)Jeter, Derek Sanderson, 1974–, American baseball player, b. Pequannock, N.J. Drafted by the New York Yankees' in 1992, he played in the minors until he was first called up in 1995. His first full se...

Huggins, Sir William

(Encyclopedia)Huggins, Sir William, 1824–1910, English astronomer. Using a spectroscope, he began to study the chemical constitution of stars from the observatory attached to his home in Tulse Hill, London. He pr...

Eastman, George

(Encyclopedia)Eastman, George, 1854–1932, American inventor, industrialist, and philanthropist, b. Waterville, N.Y. By mass production of his photographic inventions, Eastman enormously stimulated the development...