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ultraviolet radiation

(Encyclopedia)ultraviolet radiation, invisible electromagnetic radiation between visible violet light and X rays; it ranges in wavelength from about 400 to 4 nanometers and in frequency from about 1015 to 1017 hert...

humor

(Encyclopedia)humor, according to ancient theory, any of four bodily fluids that determined human health and temperament. Hippocrates postulated that an imbalance among the humors (blood, phlegm, yellow bile, and b...

Hammerstein, Oscar, 2d

(Encyclopedia)Hammerstein, Oscar, 2d, 1895–1960, American lyricist and librettist, b. New York City, grad. Columbia, 1916; grandson of Oscar Hammerstein. His first success was Wildflower (1923), with music by Vin...

Valais

(Encyclopedia)Valais välāˈ [key], Ger. Wallis, canton (1993 pop. 262,400), 2,021 sq mi (5,234 sq km), S Switzerland. Sion is the capital. Bordering on France and Italy, the Valais extends from the Bernese Alps i...

Schwyz

(Encyclopedia)Schwyz shvēts [key], canton (1993 pop. 116,100), 351 sq mi (909 sq km), central Switzerland, one of the Four Forest Cantons. Bordering on the Lake of Zürich in the north and the Lake of Lucerne in t...

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...

art history

(Encyclopedia)art history, the study of works of art and architecture. In the mid-19th cent., art history was raised to the status of an academic discipline by the Swiss Jacob Burckhardt, who related art to its cul...

Socinus, Laelius

(Encyclopedia)Socinus, Laelius lāˈlyō [key], 1525–62, Italian religious reformer. After becoming interested in Protestantism, Socinus left Italy in 1544 for the Swiss cantons to escape the newly established In...

National Socialism

(Encyclopedia)National Socialism or Nazism, doctrines and policies of the National Socialist German Workers' party, which ruled Germany under Adolf Hitler from 1933 to 1945. In German the party name was Nationalsoz...

tracer

(Encyclopedia)tracer, an identifiable substance used to follow the course of a physical, chemical, or biological process. In chemistry the ideal tracer has the same chemical properties as the molecule it replaces a...