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Paris, Treaty of

(Encyclopedia)Paris, Treaty of, any of several important treaties, signed at or near Paris, France. For the Treaty of Paris of 1856, see Paris, Congress of. For the Treaty of Paris of 1898, see Spanish-Americ...

polarization of light

(Encyclopedia)polarization of light, orientation of the vibration pattern of light waves in a singular plane. Unpolarized light can be converted into a single polarized beam by means of the Nicol prism, a device ...

Library of Congress

(Encyclopedia)Library of Congress, national library of the United States, Washington, D.C., est. 1800. It occcupies three buildings on Capitol Hill: The Thomas Jefferson Building (1897), the John Adams Building (19...

Eleanor of Aquitaine

(Encyclopedia)Eleanor of Aquitaine ăkwĭtānˈ, ăkˈwĭtān [key], 1122?–1204, queen consort first of Louis VII of France and then of Henry II of England. Daughter and heiress of William X, duke of Aquitaine, s...

Godfrey of Bouillon

(Encyclopedia)Godfrey of Bouillon bo͞oyôNˈ [key], c.1058–1100, Crusader, duke of Lower Lorraine. He fought for Holy Roman Emperor Henry IV against Pope Gregory VII and against Rudolf of Swabia and was rewarded...

Paris, Declaration of

(Encyclopedia)Paris, Declaration of, 1856, agreement concerning the rules of maritime warfare, issued at the Congress of Paris. It was the first major attempt to codify the international law of the sea. Conflicting...

calculus of variations

(Encyclopedia)calculus of variations, branch of mathematics concerned with finding maximum or minimum conditions for a relationship between two or more variables that depends not only on the variables themselves, a...

Salamanca, University of

(Encyclopedia)Salamanca, University of, at Salamanca, Spain; founded 1218 by Alfonso IX of León, reorganized 1254 by Alfonso X of Castile and León. It has faculties of philosophy, philology, geography and history...

Richard of Devizes

(Encyclopedia)Richard of Devizes dĭvīˈzĭz [key], fl. late 12th cent., English chronicler and monk. He wrote a lively Chronicon de rebus gestis Ricardi primi [chronicle of the deeds of Richard I], a valuable his...

Pennsylvania, University of

(Encyclopedia)Pennsylvania, University of, in Philadelphia; private with some state support; coeducational. It dates to 1740 and plans for a charity school, and the first predecessor opened in 1751 as an academy, l...