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Rodchenko, Aleksandr

(Encyclopedia)Rodchenko, Aleksandr. 1891–1956, Russian painter, sculptor, photographer, and designer, b. St. Petersburg. One of the most important and versatile avant-garde artists to emerge after the Russian Rev...

speed

(Encyclopedia)speed, change in distance with respect to time. Speed is a scalar rather than a vector quantity; i.e., the speed of a body tells one how fast the body is moving but not the direction of the motion. If...

stroboscope

(Encyclopedia)stroboscope strŏbˈəskōp [key], optical instrument for making a moving object appear to be slowed down or stationary. This effect is created by interrupting the observer's view so that the object i...

hearing aid

(Encyclopedia)hearing aid, device used in some forms of deafness to amplify sound before it reaches the auditory organs. Modern hearing aids are electronic. They contain a tiny receiver and a transistor amplifier, ...

onomatopoeia

(Encyclopedia)onomatopoeia ŏnˌəmătˌəpēˈə [key] [Gr.,=word-making], in language, the representation of a sound by an imitation thereof; e.g., the cat mews. Poets often convey the meaning of a verse through ...

Bremerton

(Encyclopedia)Bremerton brĕmˈərtən [key], city (2020 pop. 43,505), Kitsap co., NW Wash., a harbor on an arm ...

Chatsworth

(Encyclopedia)Chatsworth, estate, Derbyshire, central England, near Chesterfield. It is the seat of the dukes of Devonshire. Begun in 1552, the present Classical-style Chatsworth House was rebuilt in 1686. It has n...

Hell Gate

(Encyclopedia)Hell Gate, narrow channel of the East River, SE N.Y., between Wards Island and Astoria, Queens, New York City. Named Hellegat by the Dutch navigator Adriaen Block, who passed through it into Long Isla...

Mach number

(Encyclopedia)Mach number mäk [key] [for E. Mach], ratio between the speed of an object and the speed of sound in the medium in which the object is traveling. An airplane that has the velocity of Mach 3.0 is trave...

harmonic

(Encyclopedia)harmonic. 1 Physical term describing the vibration in segments of a sound-producing body (see sound). A string vibrates simultaneously in its whole length and in segments of halves, thirds, fourths, e...