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Potsdam

(Encyclopedia)Potsdam pŏtsˈdăm [key], city (1994 pop. 139,262), capital of Brandenburg, E Germany, on the Havel River, near Berlin. It is an industrial center and rail junction. Manufactures include processed fo...

perturbation

(Encyclopedia)perturbation pŭrˌtərbāˈshən [key], in astronomy and physics, small force or other influence that modifies the otherwise simple motion of some object. The term is also used for the effect produce...

jet propulsion

(Encyclopedia)CE5 Types of jet engines: In the propeller-driven turbine a stream of high-velocity gases provides the power to drive the turbine and turn the propeller. In the jet-driven turbine the stream of gas...

Morley, Edward Williams

(Encyclopedia)Morley, Edward Williams, 1838–1923, American scientist, b. Newark, N.J., grad. Williams College, 1860. From 1869 to 1906 he was professor of chemistry at Western Reserve College (now Case Western Re...

music hall

(Encyclopedia)music hall. In England, the Licensing Act of 1737 confined the production of legitimate plays to the two royal theaters—Drury Lane and Covent Garden; the demands for entertainment of the rising lowe...

Rumford, Benjamin Thompson, Count

(Encyclopedia)Rumford, Benjamin Thompson, Count, 1753–1814, American-British scientist and administrator, b. Woburn, Mass. In 1776 he went to England, where he served (1780–81) as undersecretary of the colonies...

Times Square

(Encyclopedia)Times Square, in New York City. Formed by the intersection of Broadway, Seventh Ave., and 42d St., this famous square was named (1904) for the building there that formerly belonged to the New York Tim...

Belmonte, Juan

(Encyclopedia)Belmonte, Juan hwän bĕlmōnˈtā [key], 1892–1962, Spanish matador, b. Seville. He is generally considered the greatest matador of all time, as remarkable for the poetry of his motion in the bullr...

ephemeris time

(Encyclopedia)ephemeris time (ET), astronomical time defined by the orbital motions of the earth, moon, and planets. The earth does not rotate with uniform speed, so the solar day is an imprecise unit of time. Ephe...

odometer

(Encyclopedia)odometer ōdŏmˈĭtər [key], instrument provided in an automotive vehicle to indicate the total number of miles that have been traveled. The odometer generally shares a housing with the vehicle's sp...