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graphite

(Encyclopedia)graphite grăfˈīt [key], 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 m...

Mandeville, Sir John

(Encyclopedia)Mandeville, Sir John, 14th-century English author of The Travels of Sir John Mandeville. Originally written in Norman French, the work became enormously popular and was translated into English, Latin,...

Lockyer, Sir Joseph Norman

(Encyclopedia)Lockyer, Sir Joseph Norman lŏkˈyər [key], 1836–1920, English astronomer, educated on the Continent. One of the first to make a spectroscopic examination of the sun and stars, he devised (1868), i...

Whitman, Marcus

(Encyclopedia)Whitman, Marcus, 1802–47, American pioneer and missionary in the Oregon country, b. Federal Hollow (later Rushville), N.Y. In 1836 he left a country medical practice to go West as a missionary for t...

Wyeth, Nathaniel Jarvis

(Encyclopedia)Wyeth, Nathaniel Jarvis, 1802–56, American explorer and trader in the far West, b. Cambridge, Mass. A businessman in Boston, he was fired with a desire to go to Oregon by the eloquence of Hall J. Ke...

Western Union Telegraph Company

(Encyclopedia)Western Union Telegraph Company, enterprise created (1851) to provide telegraphic communications services in the United States. Originally known as the New York and Mississippi Valley Printing Telegra...

Burlingame, Anson

(Encyclopedia)Burlingame, Anson bûrˈlĭng-gām [key], 1820–70, American diplomat, b. New Berlin, N.Y. He became a lawyer in Boston and later (1855–61) a Congressman. Defeated for reelection, he was made (1861...

Plata, Río de la

(Encyclopedia)Plata, Río de la rēˈō ᵺā lä pläˈtä [key], estuary, c.170 mi (270 km) long, SE South America, formed by the Paraná and Uruguay rivers. Between Argentina and Uruguay, the estuary is c.120 mi...

San Andreas fault

(Encyclopedia)San Andreas fault, great fracture (see fault) of the earth's crust in California. It is the principal fault of an intricate network of faults extending more than 600 mi (965 km) from NW California to ...

Paleozoic era

(Encyclopedia)Paleozoic era pāˌlēəzōˈĭk [key], a major division (era) of geologic time (see Geologic Timescale, tablegeologic timescale, table) occurring between 570 to 240 million years ago. It is subdivide...