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United States Naval Observatory

(Encyclopedia)United States Naval Observatory, a federal astronomical observatory, located in Washington, D. C. It evolved from the Navy's oldest scientific institution, the Depot of Charts and Instruments, founded...

Gilman, Daniel Coit

(Encyclopedia)Gilman, Daniel Coit, 1831–1908, American educator, first president of Johns Hopkins Univ., b. Norwich, Conn., grad. Yale, 1852. After serving as attaché (1853–55) of the American legation at St. ...

Germain, George Sackville, 1st Viscount Sackville

(Encyclopedia)Germain, George Sackville, 1st Viscount Sackville jûrˈmən, –mān [key], 1716–85, British soldier and statesman. He was known as Lord George Sackville until 1770, when under the terms of a will ...

Nordenskjöld, Nils Adolf Erik, Baron

(Encyclopedia)Nordenskjöld, Nils Adolf Erik, Baron nĭls äˈdôlf āˈrĭk no͞orˈdənshöld [key], 1832–1901, Swedish geologist and arctic explorer, first to navigate the Northeast Passage, b. Finland. He ser...

zone

(Encyclopedia)zone [Gr.,=girdle], in geography, area with a certain physical and/or cultural unity that distinguishes it from other areas. The division of the earth into five climatic zones probably originated (5th...

Miles, Nelson Appleton

(Encyclopedia)Miles, Nelson Appleton, 1839–1925, American army officer, b. near Westminster, Mass. In 1861, at the outbreak of the Civil War, he left his job in a Boston store and organized a company of volunteer...

National Radio Astronomy Observatory

(Encyclopedia)National Radio Astronomy Observatory (NRAO), federal observatory for radio astronomy, founded in 1956 and operated under contract with the National Science Foundation by Associated Universities, Inc.,...

Hoover Dam

(Encyclopedia)Hoover Dam, 726 ft (221 m) high and 1,244 ft (379 m) long, on the Colorado River between Nev. and Ariz.; one of the world's largest dams. Built between 1931 and 1936 by the U.S. Bureau of Reclamation,...

pigment

(Encyclopedia)pigment, substance that imparts color to other materials. In paint, the pigment is a powdered substance which, when mixed in the liquid vehicle, imparts color to a painted surface. The pigments used i...

Mantegna, Andrea

(Encyclopedia)Mantegna, Andrea ändrĕˈä mäntĕˈnyä [key], 1431–1506, Italian painter of the Paduan school. He was adopted by Squarcione, whose apprentice he remained until 1456, when he procured his release...