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motor, electric

(Encyclopedia)CE5 Motor: In the AC motor, current fed to the conducting loop of wire causes it to rotate in the magnetic field, thus turning the shaft on which the loop is mounted. In the DC motor, the direction...

Democritus

(Encyclopedia)Democritus dĭmŏkˈrĭtəs [key], c.460–c.370 b.c., Greek philosopher of Abdera; pupil of Leucippus. His theory of the nature of the physical world was the most radical and scientific attempted up ...

airfoil

(Encyclopedia)airfoil, surface designed to develop a desired force by reaction with a fluid, especially air, that is flowing across the surface. For example, the fixed wing surfaces of an airplane produce lift, whi...

sound recording

(Encyclopedia)sound recording, process of converting the acoustic energy of sound into some form in which it can be permanently stored and reproduced at any time. In 1855 the inventor Leon Scott constructed a devic...

flight

(Encyclopedia)CE5 Aircraft motions and control surfaces: Yaw, or motion to the left or right, is controlled by the rudder. Pitch, or climbing or dropping, is controlled by the elevators, which move in the same d...

Alemán, Mateo

(Encyclopedia)Alemán, Mateo mätāˈō älāmänˈ [key], 1547–1614?, Spanish novelist, b. Seville. Alemán studied medicine and practiced accounting. He led a turbulent life, was sent to jail twice for his debt...

Isaacs, Jorge

(Encyclopedia)Isaacs, Jorge hôrˈhā ēˈsäks [key], 1837–95, Colombian novelist. The son of a prosperous Englishman and a creole, Isaacs witnessed the ruin and premature death of his parents and the despoilmen...

Guido of Siena

(Encyclopedia)Guido of Siena sēĕnˈə [key], fl. 13th cent., Italian painter. All that is known of him is an inscription on a large and almost completely repainted Virgin and Child Enthroned, formerly in San Dome...

Mansfield, Sir Peter

(Encyclopedia)Mansfield, Sir Peter, 1933–2017, British physicist, Ph.D. Queen Mary College, London, 1962. He was a professor at the Univ. of Nottingham from 1964 to 1994. In 2003 Mansfield shared the Nobel Prize ...

Walton, Izaak

(Encyclopedia)Walton, Izaak, 1593–1683, English writer. He wrote one of the most famous books in the English language, The Compleat Angler; or, the Contemplative Man's Recreation. The first edition appeared in 16...