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Ferrier, Kathleen

(Encyclopedia)Ferrier, Kathleen, 1912–53, British contralto, b. Higher Walton, Lancashire. Ferrier began voice lessons at 25. She became known for her rich, expressive, and remarkably low voice. Her celebrated pe...

Rusk, Jeremiah McLain

(Encyclopedia)Rusk, Jeremiah McLain, 1830–93, American political leader, b. Malta, Ohio. He became a farmer in Wisconsin, where he entered politics and held numerous offices. After serving in the Civil War, he wa...

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...

photon

(Encyclopedia)photon fōˈtŏn [key], the particle composing light and other forms of electromagnetic radiation, sometimes called light quantum. The photon has no charge and no mass. About the beginning of the 20th...

MacMillan, David W.C.

(Encyclopedia)MacMillan, David W.C., 1968–, b. Bellshill, U.K. Scotish chemist, James S. McDonnell Distiguished University Professor in Chemistry and ...

E Pluribus Unum

(Encyclopedia)E Pluribus Unum ē plo͝orˈĭbəs yo͞oˈnəm [key] [Lat.,=one made out of many], motto on the Great Seal of the United States and on many U.S. coins. Although selected in 1776 by Benjamin Franklin, ...

Lloyd, David

(Encyclopedia)Lloyd, David, c.1656–1731, political leader in colonial Pennsylvania, b. Wales. Having been commissioned attorney general of Pennsylvania by William Penn, Lloyd arrived in Philadelphia in 1686. He l...

servomechanism

(Encyclopedia)servomechanism, automatic device for the control of a large power output by means of a small power input or for maintaining correct operating conditions in a mechanism. It is a type of feedback contro...

sampler

(Encyclopedia)sampler, sample piece of needlework or embroidery, of silk, cotton, or worsted, for the preservation of some pattern or as an example of the ability of a child or a beginner. In museums and private co...

Beernaert, Auguste

(Encyclopedia)Beernaert, Auguste ōgüstˈ bârnärtˈ, bârˈnärt [key], 1829–1912, Belgian statesman. A member of the liberal wing of the Catholic party, he served in several cabinets and was prime minister fr...