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relativity

(Encyclopedia)relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequ...

Degas, Edgar

(Encyclopedia)Degas, Edgar (Hilaire Germain Edgar Degas) ēlĕrˈ zhĕrmăNˈ ĕdgärˈ dəgäˈ [key], 1834–1917, French painter and sculptor, b. Paris; son of a banker. Although prepared for the law, he abandon...

Mitchel, John

(Encyclopedia)Mitchel, John, 1815–75, Irish revolutionist and journalist. A practicing lawyer, Mitchel contributed articles to the Nation (Dublin) and the United Irishman, which he founded in 1848, calling for re...

record player

(Encyclopedia)record player or phonograph, device for reproducing sound that has been recorded as a spiral, undulating groove on a disk. This disk is known as a phonograph record, or simply a record (see sound reco...

Penn, Irving

(Encyclopedia)Penn, Irving, 1917–2009, American photographer, elder brother of Arthur Penn, b. Plainfield, N.J.; studied Philadelphia Museum School of Industrial Art (now University of the Arts, 1934–38). Origi...

Parmenides

(Encyclopedia)Parmenides pärmĕnˈĭdēz [key], b. c.515 b.c., Greek philosopher of Elea, leading figure of the Eleatic school. Parmenides' great contribution to philosophy was the method of reasoned proof for ass...

Einstein, Albert

(Encyclopedia)Einstein, Albert īnˈstīn [key], 1879–1955, American theoretical physicist, known for the formulation of the relativity theory, b. Ulm, Germany. He is recognized as one of the greatest physicists ...

Wyler, William

(Encyclopedia)Wyler, William, 1902–1981, American film director, producer, and writer, b. Mülhausen, Germany (now Mulhouse, France) as Willi Wilder. He came to the United States (1920) at the invitation of Carl ...

phonetics

(Encyclopedia)phonetics fōnĕtˈĭks, fə– [key], study of the sounds of languages from three basic points of view. Phonetics studies speech sounds according to their production in the vocal organs (articulatory...

loudspeaker

(Encyclopedia)CE5 Electrodynamic loudspeaker loudspeaker or speaker, device used to convert electrical energy into sound. It consists essentially of a thin flexible sheet called a diaphragm that is made to vibr...