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Renton

(Encyclopedia)Renton, city (1990 pop. 41,688), King co., W Wash., an industrial suburb of Seattle, on Lake Washington; inc. 1901. It is a freshwater port of entry via the Lake Washington Ship Canal. Its first impor...

sonar

(Encyclopedia)sonar sōˈnär [key], device used underwater for locating submerged objects and for submarine communication by means of sound waves. The term sonar is an acronym for sound navigation ranging. The mai...

Trenchard, Hugh Montague Trenchard, 1st Viscount

(Encyclopedia)Trenchard, Hugh Montague Trenchard, 1st Viscount, 1873–1956, British air marshal. He entered the army in 1893 and served in the South African War. During World War I he commanded the Royal Flying Co...

ratite

(Encyclopedia)ratite rătˈīt [key], common and general term for a variety of flightless birds characterized by a flat, raftlike sternum rather than the keeled sternum, designed to support flight muscles, typical ...

Lilienthal, Otto

(Encyclopedia)Lilienthal, Otto ôˈtō lēˈlyəntäl [key], 1848–96, German aeronautical engineer, a pioneer in his experiments with gliders. He made major developments in the glider based on his observations of...

sonic boom

(Encyclopedia)CE5 Sonic boom wave pattern from a supersonic aircraft and variation in pressure sonic boom, shock wave produced by an object moving through the air at supersonic speed, i.e., faster than the spee...

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...

Ramah

(Encyclopedia)Ramah rāˈmə [key], in the Bible. 1 Town, NE ancient Palestine, allotted to Naphtali. 2 Town of Asher. 3 Unidentified town of Simeon, called Ramah of the south. It is apparently intended by the Ramo...

harmonic motion

(Encyclopedia)CE5 Harmonic motion is exhibited by a weight vibrating on the end of a spring. In A, the displacement of the object from its equilibrium position and the acceleration of the object are at a maximum...

Fraser Island

(Encyclopedia)Fraser Island or Great Sandy Island, 66 sq mi (171 sq km), in the Pacific Ocean off the coast of Queensland, Australia; on the west it borders Hervey Bay (NW) and the Great Sandy Strait (SW). Known as...