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Charles III, emperor of the West, king of the East Franks, and king of the West Franks

(Encyclopedia)Charles III or Charles the Fat, 839–88, emperor of the West (881–87), king of the East Franks (882–87), and king of the West Franks (884–87); son of Louis the German, at whose death he inherit...

Carloman, d. 754, mayor of the palace in the kingdom of Austrasia, brother of Pepin the Short

(Encyclopedia)Carloman, d. 754, mayor of the palace in the kingdom of Austrasia after the death (741) of his father, Charles Martel. Ruling with his brother, Pepin the Short, he carried on successful wars against t...

Cherenkov radiation

(Encyclopedia)Cherenkov radiation or Cerenkov radiation [for P. A. Cherenkov], light emitted by a transparent medium when charged particles pass through it at a speed greater than the speed of light in the medium. ...

haze

(Encyclopedia)haze, suspension in the atmosphere of minute dust or salt particles that are not individually seen but that nevertheless reduce visibility. So-called damp haze and dry haze produce different optical e...

airline industry

(Encyclopedia)airline industry, the business of transporting paying passengers and freight by air along regularly scheduled routes, typically by airplanes but also by helicopter. Ferdinand Graf von Zeppelin set up ...

Davis, Raymond, Jr.

(Encyclopedia)Davis, Raymond, Jr., 1914–2006, American astrochemist, Ph.D. Yale Univ. 1942. Davis, who served in the Army Air Forces from 1942 to 1946, was a researcher at Monsanto Chemical Company (1946–48) an...

physics

(Encyclopedia)physics, branch of science traditionally defined as the study of matter, energy, and the relation between them; it was called natural philosophy until the late 19th cent. and is still known by this na...

harmony

(Encyclopedia)harmony, in music, simultaneous sounding of two or more tones and, especially, the study of chords and their relations. Harmony was the last in the development of what may be considered the basic elem...

mass spectrograph

(Encyclopedia)mass spectrograph, device used to separate electrically charged particles according to their masses; a form of the instrument known as a mass spectrometer is often used to measure the masses of isotop...

Hall effect

(Encyclopedia)Hall effect, experiment that shows the sign of the charge carriers in a conductor. In 1879 E. H. Hall discovered that when he placed a metal strip carrying a current in a magnetic field, a voltage dif...