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Paley Center for Media

(Encyclopedia)Paley Center for Media, American archive of radio and television programs, and forum for the discussion of the role and evolution of electronic media as well as the intersections of media and society;...

Saca González, Elías Antonio

(Encyclopedia)Saca González, Elías Antonio ālēˈäs äntōˈnēō säˈkä gōnsälˈās [key], 1965–, Salvadoran political leader, president of El Salvador (2004–9), b. Usulután. “Tony” Saca worked as...

Sarnoff, David

(Encyclopedia)Sarnoff, David, 1891–1971, American pioneer in radio and television, b. Russia. Emigrating to the United States in 1900, he worked for the Marconi Wireless Company, winning recognition as the narrat...

Playfair, John

(Encyclopedia)Playfair, John, 1748–1819, Scottish mathematician, physicist, and geologist. He was educated at St. Andrews and Edinburgh and taught first mathematics and then physics and astronomy at the latter un...

frequency modulation

(Encyclopedia)frequency modulation: see modulation; radio. ...

amplitude modulation

(Encyclopedia)amplitude modulation: see modulation; radio. ...

audio frequency

(Encyclopedia)audio frequency: see sound; radio. ...

altimeter

(Encyclopedia)altimeter ăltĭmˈĭtər, ălˈtĭmēˌtər [key], device for measuring altitude. The most common type is an aneroid barometer calibrated to show the drop in atmospheric pressure in terms of linear e...

Ganesa

(Encyclopedia)Ganesa gənāˈsə [key], b. 1507, d. after 1564, Indian astronomer. As a boy of 13 in a village N of Mumbai, Ganesa wrote a treatise on astronomy, the Grahalaghava, which has often been reprinted and...

Lowell, Percival

(Encyclopedia)Lowell, Percival, 1855–1916, American astronomer, b. Boston, grad. Harvard, 1876; brother of Abbott Lawrence Lowell and Amy Lowell. He visited Korea and Japan, where he acted as counselor and foreig...