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infrared radiation

(Encyclopedia)infrared radiation, electromagnetic radiation having a wavelength in the range from c.75 × 10−6 cm to c.100,000 × 10−6 cm (0.000075–0.1 cm). Infrared rays thus occupy that part of the electrom...

Bond, William Cranch

(Encyclopedia)Bond, William Cranch, 1789–1859, American astronomer, b. Portland, Maine. He early aided his father in the trades of silversmith and clockmaker in Boston. He soon became an expert in the making of c...

Herschel

(Encyclopedia)Herschel hûrˈshəl [key], family of distinguished English astronomers. Sir William Herschel,Sir William Herschel, 1738–1822, born Friedrich Wilhelm Herschel, was a great pioneer in astronomy. Bor...

Poulsen, Valdemar

(Encyclopedia)Poulsen, Valdemar välˈdəmär poulˈsən [key], 1869–1942, Danish electrical engineer. He invented (1898) the telegraphone (an early wire recorder) and the high-frequency Poulsen arc used in wirel...

Brighouse

(Encyclopedia)Brighouse, town, Calderdale metropolitan district, N central England, on the Calder River. It is a center of wool, cotton, and silk milling and produces...

D'Aquino, Iva Toguri

(Encyclopedia)D'Aquino, Iva Toguri, 1916–2006, American citizen of Japanese descent, best-known of some dozen women who, during World War II, made English propaganda broadcasts to American troops on Radio Tokyo; ...

declination

(Encyclopedia)declination, in astronomy, one of the coordinates in the equatorial coordinate system. The declination of a celestial body is its angular distance north or south of the celestial equator measured alon...

electronics

(Encyclopedia)electronics, science and technology based on and concerned with the controlled flow of electrons or other carriers of electric charge, especially in semiconductor devices. It is one of the principal b...

Nacka

(Encyclopedia)Nacka näˈkä [key], city (1994 est. pop. 69,120), Stockholm co., E Sweden, on the Baltic Sea, a suburb of Stockholm. It has radio and television stations and shipyards. Manufactures include steam tu...

Penticton

(Encyclopedia)Penticton, city (1991 pop. 27,258), S British Columbia, Canada, located where the Okanagan River flows into Okanagan Lake. It is a service and trade center for the Okanagan valley, a resort and fruit-...