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irrigation

(Encyclopedia)irrigation, in agriculture, artificial watering of the land. Although used chiefly in regions with annual rainfall of less than 20 in. (51 cm), it is also used in wetter areas to grow certain crops, e...

mass, in physics

(Encyclopedia)mass, in physics, the quantity of matter in a body regardless of its volume or of any forces acting on it. The term should not be confused with weight, which is the measure of the force of gravity (se...

aerial and satellite photography

(Encyclopedia)aerial and satellite photography, technology and science of taking still or moving-picture photographs from a camera mounted on a balloon, airplane, satellite, rocket, or spacecraft. In the 19th cent....

Froebel, Friedrich Wilhelm August

(Encyclopedia)Froebel, Friedrich Wilhelm August frāˈbəl, frōˈ–, Ger. frēˈdrĭkh vĭlˈhĕlm ouˈgo͝ost fröˈbəl [key], 1782–1852, German educator and founder of the kindergarten system. He had an unha...

Opéra

(Encyclopedia)Opéra ôpāräˈ [key] (Académie de musique), former chief opera house of Paris, on the Place de l'Opéra, one of the main crossroads on the right bank of the Seine. Designed by J. L. C. Garnier and...

Stuart, James Ewell Brown

(Encyclopedia)Stuart, James Ewell Brown (Jeb Stuart), 1833–64, Confederate cavalry commander in the American Civil War, b. Patrick co., Va. Most of his U.S. army service was with the 1st Cavalry in Kansas. On Vir...

Villon, François

(Encyclopedia)Villon, François fräNswäˈ vēyôNˈ [key], 1431–1463?, French poet, b. Paris, whose original name was François de Montcorbier or François Des Loges. One of the earliest great poets of France, ...

generator

(Encyclopedia)CE5 Generator: The rotation of the conducting coil of wire in a magnetic field causes a current to be induced in the coil. This current is alternating and is conducted from the coil by means of sli...

Manila

(Encyclopedia)Manila mənĭlˈə [key], city (1990 pop. 1,601,234), capital of the Philippines, SW Luzon, on Manila Bay. Manila is the center of the country's largest metropolitan area, its chief port, and the focu...

Oppenheimer, J. Robert

(Encyclopedia)Oppenheimer, J. Robert ŏpˈənhīˌmər [key], 1904–67, American physicist, b. New York City, grad. Harvard (B.A., 1925), Ph.D. Univ. of Göttingen, 1927. He taught at the Univ. of California and t...