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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...

McAdoo, William Gibbs

(Encyclopedia)McAdoo, William Gibbs măkˈədo͞o [key], 1863–1941, American political leader, U.S. secretary of the treasury (1913–18), b. near Marietta, Ga. The son of a prominent Georgia jurist, McAdoo becam...

Meigs, Return Jonathan

(Encyclopedia)Meigs, Return Jonathan mĕgz [key], 1740–1823, American Revolutionary army officer, b. Middletown, Conn. He accompanied Benedict Arnold on the Quebec expedition, where he was taken prisoner and late...

Mikoyan, Anastas Ivanovich

(Encyclopedia)Mikoyan, Anastas Ivanovich ənəstäsˈ ēväˈnəvĭch myĭkəyänˈ [key], 1895–1978, Soviet Communist leader. He joined the Communist party in 1915, became a member of the party's central committ...

Minghetti, Marco

(Encyclopedia)Minghetti, Marco märˈkō mēngĕtˈtē [key], 1818–86, Italian political leader. A former papal minister, Minghetti—a liberal conservative—became a supporter of Italian unification as a result...

Mason, John Young

(Encyclopedia)Mason, John Young, 1799–1859, American statesman, b. Greensville co., Va. He studied law under Tapping Reeve at Litchfield, Conn., and was admitted to the Virginia bar in 1819. Mason served in the s...

Massamba-Débat, Alphonse

(Encyclopedia)Massamba-Débat, Alphonse, 1921–77, Congolese politician. A teacher, he became involved in the independence movement. He was elected to the legislative assembly in 1959 and was its president (1959�...

Maximilian, prince of Baden

(Encyclopedia)Maximilian, prince of Baden (Max of Baden), 1867–1929, German statesman, last chancellor of imperial Germany. A liberal, he was made imperial chancellor at the end of World War I as Germany neared d...

Saionji, Kimmochi, Prince

(Encyclopedia)Saionji, Kimmochi, Prince kēmōˈchē sīōnˈjē [key], 1850–1940, Japanese statesman. He took part in the Meiji restoration, then spent 10 years in France, absorbing many democratic ideas. In 188...

Togliatti, Palmiro

(Encyclopedia)Togliatti, Palmiro pälmēˈrō tōlyätˈtē [key], 1893–1964, Italian Communist leader. A lawyer, he helped found the Italian Communist party in 1921. He lived in Moscow for many years after the F...