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Allen, Ethan

(Encyclopedia)Allen, Ethan, 1738–89, hero of the American Revolution, leader of the Green Mountain Boys, and promoter of the independence and statehood of Vermont, b. Litchfield (?), Conn. He had some schooling a...

Pennsylvania Dutch

(Encyclopedia)Pennsylvania Dutch [Ger. Deutsch=German], people of E Pennsylvania of German descent who migrated to the area in the 18th cent., particularly those in Northampton, Berks, Lancaster, Lehigh, Lebanon, Y...

Pittsburgh

(Encyclopedia)Pittsburgh pĭtsˈbərg [key], city (1990 pop. 369,879), seat of Allegheny co., SW Pa., at the confluence of the Allegheny and the Monongahela rivers, which there form the Ohio River; inc. 1816. A maj...

viscosity

(Encyclopedia)viscosity, resistance of a fluid to flow. This resistance acts against the motion of any solid object through the fluid and also against motion of the fluid itself past stationary obstacles. Viscosity...

census

(Encyclopedia)census, periodic official count of the number of persons and their condition and of the resources of a country. In ancient times, among the Jews and Romans, such enumeration was mainly for taxation an...

army

(Encyclopedia)army, large armed land force, under regular military control, organization, and discipline. With the advent of railroads and, later, highway systems it became possible after the mid-19th cent. to mo...

European Monetary System

(Encyclopedia)European Monetary System, arrangement by which most nations of the European Union (EU) linked their currencies to prevent large fluctuations relative to one another. It was organized in 1979 to stabil...

atom

(Encyclopedia)CE5 Bohr-Rutherford atom CE5 Probability distribution of the electron in the hydrogen atom: A. Ground state B. Highly excited state atom [Gr.,=uncuttable (indivisible)], basic unit of matte...

equatorial coordinate system

(Encyclopedia)CE5 Equatorial coordinate system equatorial coordinate system, the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celesti...

Herschel

(Encyclopedia)Herschel hûrˈshəl [key], family of distinguished English astronomers. Sir William Herschel,Sir William Herschel, 1738–1822, born Friedrich Wilhelm Herschel, was a great pioneer in astronomy. Bor...