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Charles Albert

(Encyclopedia)Charles Albert, 1798–1849, king of Sardinia (1831–49, see Savoy, house of). Because he had not been entirely unsympathetic to the revolutionary movement of 1821 in Sardinia, Charles Albert develop...

Chen Duxiu

(Encyclopedia)Chen Duxiu or Ch'en Tu-hsiu both: chŭn do͞o-shyo͞o [key], 1879–1942, Chinese educator and Communist party leader. He was active in the republican revolution of 1911 and was forced to flee to Japa...

altitude

(Encyclopedia)altitude, vertical distance of an object above some datum plane, such as mean sea level or a reference point on the earth's surface. It is usually measured by the reduction in atmospheric pressure wit...

engraving

(Encyclopedia)engraving, in its broadest sense, the art of cutting lines in metal, wood, or other material either for decoration or for reproduction through printing. In its narrowest sense, it is an intaglio print...

House Un-American Activities Committee

(Encyclopedia)House Un-American Activities Committee (HUAC), a committee (1938–75) of the U.S. House of Representatives, created to investigate disloyalty and subversive organizations. Its first chairman, Martin ...

Gay-Lussac, Joseph Louis

(Encyclopedia)Gay-Lussac, Joseph Louis zhôzĕfˈ lwē gā-lüsäkˈ [key], 1778–1850, French chemist and physicist. He was professor in Paris at the Sorbonne, at the Polytechnic School, and at the Jardin des Pla...

gas

(Encyclopedia)gas, in physics, one of the three commonly recognized states of matter, the other two being solid and liquid. A substance in the gaseous state has neither definite shape nor definite volume. Like liqu...

elevator, in machinery

(Encyclopedia)elevator, in machinery, device for transporting people or goods from one level to another. The term is applied to the enclosed structures as well as the open platforms used to provide vertical transpo...

John II, king of Hungary and prince of Transylvania

(Encyclopedia)John II (John Sigismund Zapolya), 1540–71, king of Hungary and prince of Transylvania, son of John I. Through his mother, Isabel (daughter of Sigismund I of Poland), he was related to the Jagiello d...

microphone

(Encyclopedia)microphone, device for converting sound into electrical energy, used in radio broadcasting, recording, and sound amplifying systems. Its basic component is a diaphragm that responds to the pressure or...