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D'Alembert's principle

(Encyclopedia)D'Alembert's principle dălˈəmbârzˌ [key], in mechanics, principle permitting the reduction of a problem in dynamics to one in statics. This is accomplished by introducing a fictitious force equal...

hydraulics

(Encyclopedia)hydraulics, branch of engineering concerned mainly with moving liquids. The term is applied commonly to the study of the mechanical properties of water, other liquids, and even gases when the effects ...

Pinza, Ezio

(Encyclopedia)Pinza, Ezio ātsˈyō pēnˈtsä [key], 1892–1957, Italian bass, b. Rome, studied at the Bologna Conservatory. After military service (1915–19), he resumed his operatic career in Rome, later singi...

Neptune, in astronomy

(Encyclopedia)Neptune, in astronomy, 8th planet from the sun at a mean distance of about 2.8 billion mi (4.5 billion km) with an orbit lying between those of Uranus and the dwarf planet Pluto; its period of revolut...

binary star

(Encyclopedia)CE5 A. Eclipsing binary: Primary component passing behind secondary (dimmer) component B. Light curve for eclipsing binary binary star or binary system, pair of stars that are held together by the...

Steen, Jan

(Encyclopedia)Steen, Jan yän stān [key], 1626–79, Dutch genre painter, b. Leiden. He studied in Utrecht and in Haarlem under Van Ostade and Van Goyen, whose daughter he married. His huge production of paintings...

Castiglione, Baldassare, Conte

(Encyclopedia)Castiglione, Baldassare, Conte bäldäs-säˈrā kōnˈtā kästēlyōˈnā [key], 1478–1529, Italian soldier, author, and statesman attached to the court of the duke of Milan and later in the servi...

mandolin

(Encyclopedia)mandolin mănˌdəlĭnˈ, mănˈdəlĭnˌ [key], musical instrument of the lute family, with a half-pear-shaped body, a fretted neck, and a variable number of strings, plucked with the fingers or with...

barrel organ

(Encyclopedia)barrel organ, mechanical musical instrument requiring nothing but the regular rotary motion of a handle to keep it going. It probably originated at the beginning of the 18th cent., and was once used e...

Henie, Sonja

(Encyclopedia)Henie, Sonja sōˈnyə hĕnˈē [key], 1912–69, Norwegian-American figure skater and movie actress, b. Oslo, Norway. She began ice skating at the age of eight and two years later won the first of si...