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San Francisco Ballet

(Encyclopedia)San Francisco Ballet, America's first classical ballet company, est. 1933 as the San Francisco Opera Ballet by the dancer Adolph Bolm. Based at the War ...

cataract

(Encyclopedia)cataract, in medicine, opacity of the lens of the eye, which impairs vision. In the young, cataracts are generally congenital or hereditary; later they are usually the result of degenerative changes b...

potentiometer

(Encyclopedia)potentiometer. 1 Manually adjustable, variable, electrical resistor. It has a resistance element that is attached to the circuit by three contacts, or terminals. The ends of the resistance element are...

Raman effect

(Encyclopedia)Raman effect räˈmən [key], appearance of additional lines in the spectrum of monochromatic light that has been scattered by a transparent material medium. The effect was discovered by C. V. Raman i...

Helper, Hinton Rowan

(Encyclopedia)Helper, Hinton Rowan, 1829–1909, American writer, b. Davie co., N.C. He was in California during the gold rush and later returned east to write The Land of Gold (1855). His next book, The Impending ...

Grundy, Felix

(Encyclopedia)Grundy, Felix, 1777–1840, American political leader, b. Berkeley co., Va. After a successful career in Kentucky, he moved to Nashville, Tenn., where he became a noted criminal lawyer. A member (1811...

McGill, Ralph Emerson

(Encyclopedia)McGill, Ralph Emerson məgĭlˈ [key], 1898–1969, American journalist and publisher, b. E Tenn. A proponent of civil rights, he was expelled from Vanderbilt Univ. for expressing his beliefs. Beginni...

Verga, Giovanni

(Encyclopedia)Verga, Giovanni jōvänˈnē vĕrˈgä [key], 1840–1922, Italian novelist, b. Sicily. He abandoned the study of law for literature and wrote several novels of passion in the style of the French real...

equilibrium

(Encyclopedia)CE5 Equilibrium equilibrium, state of balance. When a body or a system is in equilibrium, there is no net tendency to change. In mechanics, equilibrium has to do with the forces acting on a body. ...

free energy

(Encyclopedia)free energy or Gibbs free energy, quantity derived from the relationships between heat and work studied in thermodynamics and used as a measure of the relative stability of a physical or chemical syst...