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guitar

(Encyclopedia)guitar, musical instrument related to the lute, modern guitars normally having six strings that are plucked with the fingers or strummed with a pick. Earlier versions had pairs of strings like the lut...

Edison, Thomas Alva

(Encyclopedia)Edison, Thomas Alva, 1847–1931, American inventor, b. Milan, Ohio. A genius in the practical application of scientific principles, Edison was one of the greatest and most productive inventors of his...

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...

blanket

(Encyclopedia)blanket, sheet, usually of heavy woolen, or partly woolen, cloth, for use as a shawl, bed covering, or horse covering. The blanketmaking of primitive people is one of the finest remaining examples of ...

Collier, Jeremy

(Encyclopedia)Collier, Jeremy, 1650–1726, English clergyman. Collier was imprisoned as one of the nonjurors, who refused to pledge allegiance to William III and Mary II. He later was outlawed (1696) for absolving...

Halcyone

(Encyclopedia)Halcyone ăl– [key], in Greek mythology, daughter of Aeolus and wife of Ceyx. When her husband drowned, Halcyone threw herself into the sea. Out of pity the gods changed the pair into kingfishers or...

fiber, dietary

(Encyclopedia)fiber, dietary, bulky part of food that cannot be broken down by enzymes in the small intestine of the digestive system. Almost all natural fiber comes from plants. Although fiber has little nutrition...

Ibn Tufayl

(Encyclopedia)Ibn Tufayl ĭˈbən to͞ofālˈ [key], d. 1185/86?, 12th-century Spanish-Arab philosopher and physician, b. near Granada. His chief work was a philosophical romance, Hayy ibn Yaqzan, describing the de...

Hertz, Heinrich Rudolf

(Encyclopedia)Hertz, Heinrich Rudolf hĕrts [key], 1857–94, German physicist. He confirmed J. C. Maxwell's electromagnetic theory and in the course of experiments (1886–89) produced and studied electromagnetic...

transducer

(Encyclopedia)transducer, device that accepts an input of energy in one form and produces an output of energy in some other form, with a known, fixed relationship between the input and output. One widely used class...