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Columbia Encyclopedia entry: pencil
Pencil, pointed implement used in writing or drawing to apply graphite or a similar colored solid to any surface, especially paper. From prehistoric times lumps of colored earth or chalk were used as markers. The Egyptians ruled lines with metallic lead, as did medieval monks. The so-called lead pencil—a rod of graphite encased in wood—came into use in the 16th cent. From the late 18th cent. pulverized graphite was mixed with clay to bind it and to provide different degrees of hardness—the more clay, the harder the pencil. Today the mixture is forced through dies, cut to the required length, and kiln-fired. The rods are laid in grooves of a thin board, a similar board is placed over them, and the wood is shaped into pencils, usually of round or hexagonal cross section. Pencils are also manufactured with cores of colored pigments mixed with clay and wax and of other materials. Mechanical pencils are commonly made of metal or plastic, the cores (or leads) being advanced by operating a screw mechanism or a propel-repel ejector mechanism.
Wikipedia search results for: Pencil
From Wikipedia, the free encyclopedia
A pencil is a writing implement or art medium usually constructed of a narrow, solid pigment core inside a protective casing. The case prevents the core from breaking, and also from marking the user’s hand during use. Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. They are noticeably distinct from pens, which dispense liquid or gel ink that stain the light color of the paper. Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased. Graphite pencils are used for both writing and drawing, and the result...more »
Columbia Encyclopedia search results: pencil
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  • Beeston

    Beeston, town (1991 pop. 64,785), Nottinghamshire, central England. Large pharmaceutical plants and factories there produce boilers, telecommunication equipment, fluorescent lights, textiles, ...

  • Slovyansk

    Slovyansk, city (1989 pop. 135,000), E Ukraine, in the Donets Basin. It is a railroad junction and has salt and soda works. Manufactures include machinery, ceramics, and pencils. Nearby is a h...

  • Cochin, Charles Nicolas

    Cochin, Charles Nicolas, 1715–90, French engraver, designer, writer on art, and painter to the French court. His works, more than 1,500 in number, include historical subjects, such as the Marr...

  • Willis, Nathaniel Parker

    Willis, Nathaniel Parker, 1806–67, American author, b. Portland, Maine, grad. Yale, 1827. He was editor of the periodical the Legendary and later of the Token before founding (1829) the Americ...

  • České Budĕjovice

    České Budĕjovice, Ger. Budweis, city (1991 pop. 97,243), Czech Republic, in Bohemia, on the Vltava (Moldau) River. An important road and rail hub and river port, České Budĕjovice is famous for...

  • silverpoint

    Silverpoint, method of drawing whereby a silver-tipped instrument is dragged across paper prepared with ground bone dust and gum water and then tinted with a pigment. The procedure results in ...

  • Talbot, William Henry Fox

    Talbot, William Henry Fox, 1800–1877, English inventor of photographic processes (see photography, still). A man of enormously versatile intelligence, he invented the photogenic drawing proces...

  • graphite

    Graphite, an allotropic form of carbon, known also as plumbago and black lead. It is dark gray or black, crystalline (often in the form of slippery scales), greasy, and soft, with a metallic l...

  • Martin, Agnes

    Martin, Agnes (Agnes Bernice Martin), 1912–2004, American painter, b. Macklin, Canada. She moved to the United States in 1931, became a U.S. citizen in 1950, and emerged as an important artist...

  • Velasco, José María

    Velasco, José María, 1840–1912, Mexican landscape painter; teacher of Diego Rivera. A gifted artisan descended from a family of shawl weavers, he entered the art academy of San Carlos in 1858....

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