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tuning systems

(Encyclopedia)tuning systems, methods for assigning pitches to the twelve Western pitch names that constitute the octave. The term usually refers to this procedure in the tuning of keyboard instruments. The need fo...

polyhedron

(Encyclopedia)CE5 Polyhedrons polyhedron pŏlˌēhēˈdrən [key], closed solid bounded by plane faces; each face of a polyhedron is a polygon. A cube is a polyhedron bounded by six polygons (in this case squar...

Archimedes

(Encyclopedia)Archimedes ärkĭmēˈdēz [key], 287–212 b.c., Greek mathematician, physicist, and inventor. He is famous for his work in geometry (on the circle, sphere, cylinder, and parabola), physics, mechanic...

calorie

(Encyclopedia)calorie, abbr. cal, unit of heat energy in the metric system. The measurement of heat is called calorimetry. The calorie, or gram calorie, is the quantity of heat required to raise the temperature of ...

centripetal force and centrifugal force

(Encyclopedia)CE5 Centripetal and centrifugal forces: When a ball is swung in a circle at the end of a string, centripetal and centrifugal forces act as shown above. centripetal force and centrifugal force, act...

MacVeagh, Isaac Wayne

(Encyclopedia)MacVeagh, Isaac Wayne məkvāˈ [key], 1833–1917, American political figure, U.S. Attorney General (1881), b. Chester co., Pa. A lawyer, he was the son-in-law of Simon Cameron, Republican boss of Pe...

Keating, Charles Humphrey, Jr.

(Encyclopedia)Keating, Charles Humphrey, Jr., 1923–2014, American banker, b. Cincinnati, grad. Univ. of Cincinnati College of Law (1948). Keating was a partner (1952–72) in a law firm he founded with his brothe...

Perkins, Frances

(Encyclopedia)Perkins, Frances, 1882–1965, U.S. Secretary of Labor (1933–45), b. Boston. She worked at Hull House, was executive secretary of the New York Consumers' League (1910–12) and of the New York Commi...

Trumbull, John , American painter

(Encyclopedia)Trumbull, John, 1756–1843, American painter, b. Lebanon, Conn.; son of Gov. Jonathan Trumbull. He served in the Continental Army early in the Revolution as an aide to Washington. He resigned his com...

Germanicus Caesar

(Encyclopedia)Germanicus Caesar jərmănˈĭkəs [key], 15 b.c.–a.d. 19, Roman general, son of Drusus Senior. He was adopted (a.d. 4) by his uncle Emperor Tiberius. Germanicus fought (a.d. 8) in Pannonia and Dalm...