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Hyatt, John Wesley

(Encyclopedia)Hyatt, John Wesley, 1837–1920, American inventor, b. Starkey, N.Y. He is known especially for his development of celluloid; with his brothers, he began its manufacture in 1872. He also invented the ...

Oberholtzer, Ellis Paxson

(Encyclopedia)Oberholtzer, Ellis Paxson ōˈbərhōltˌsər [key], 1868–1936, American historian, b. Chester co., Pa. He studied abroad and then worked on various Philadelphia newspapers. He edited the Manufactur...

antihistamine

(Encyclopedia)antihistamine ănˌtĭhĭsˈtəmēn [key], any one of a group of compounds having various chemical structures and characterized by the ability to antagonize the effects of histamine. Their principal u...

frequency

(Encyclopedia)frequency: see harmonic motion; wave. ...

Thomas, John Charles

(Encyclopedia)Thomas, John Charles, 1891–1960, American baritone, b. Meyersdale, Pa., studied at the Peabody Conservatory, Baltimore. After a successful career in musical comedy he made his operatic debut in Wash...

period, in physics

(Encyclopedia)period, in physics: see harmonic motion; wave. ...

Keokuk, chief of the Sac and Fox

(Encyclopedia)Keokuk kēˈəkək [key], c.1780–1848, Native American, chief of the Sac and Fox, b. near present-day Rock Island, Ill. When Black Hawk supported the British in the War of 1812, Keokuk refused to jo...

steam engine

(Encyclopedia)CE5 Steam engine steam engine, machine for converting heat energy into mechanical energy using steam as a medium, or working fluid. When water is converted into steam it expands, its volume increa...

Maxwell, James Clerk

(Encyclopedia)Maxwell, James Clerk klärk [key], 1831–79, great Scottish physicist. After a brilliant career at Edinburgh and Cambridge, where he won early recognition with mathematical papers, he was a professor...

Wallace, Lew

(Encyclopedia)Wallace, Lew (Lewis Wallace), 1827–1905, American novelist and diplomat, b. Brookville, Ind. He served in both the Mexican and Civil wars. After returning to his law practice in Indiana, he became g...