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rare earths

(Encyclopedia)rare earths, in chemistry, oxides of the rare-earth metals. They were once thought to be elements themselves. They are widely distributed in the earth's crust and are fairly abundant, although they we...

Celsius, Anders

(Encyclopedia)Celsius, Anders änˈdərs sĕlˈsēŭs [key], 1701–44, Swedish astronomer. While professor of astronomy at the Univ. of Uppsala (1730–44), he traveled through Germany, France, and Italy, visiting...

Bergman, Ingrid

(Encyclopedia)Bergman, Ingrid bûrgˈmən [key], 1915–82, Swedish actress, b. Stockholm. Specializing in portrayals of strong, dignified, and sophisticated women, Bergman was acclaimed for her performance in Joan...

Gateshead

(Encyclopedia)Gateshead gātsˈhĕd [key], metropolitan borough, NE England, on the Tyne River opposite ...

Lacaille, Nicolas Louis de

(Encyclopedia)Lacaille, Nicolas Louis de nēkôläˈ lwē də läkäˈyə [key], 1713–62, French astronomer. As a result of his success in making meridional measurements in France under the patronage of the duke ...

Chalgrin, Jean François

(Encyclopedia)Chalgrin, Jean François zhäN fräNswäˈ shälgrăNˈ [key], 1739–1811, French architect. He studied under Servandoni and in Italy as a winner of the Grand Prix de Rome (1758). He rebuilt (1777) p...

boomerang

(Encyclopedia)boomerang bo͞oˈmərăngˌ [key], special form of throwing stick, used mainly by the aborigines of Australia. Other forms of throwing sticks were used by the peoples of ancient Egypt, Ethiopia, and I...

Cévennes

(Encyclopedia)Cévennes sāvĕnˈ [key], mountain range, S France, bordering the Massif Central on the southeast. The Cévennes proper occupy the central section of a mountainous arc (average height 3,000 ft/910 m)...

Birkeland, Kristian

(Encyclopedia)Birkeland, Kristian or Olaf Christian krĭsˈtyän bērˈkəlän, ōˈläv [key], 1867–1917, Norwegian physicist. From 1898 Birkeland was a professor at the Univ. of Christiania (now Oslo). Noted fo...

furnace

(Encyclopedia)furnace, enclosed space for the burning of fuel. There are many kinds of furnaces, the type depending upon the fuel and the use to which the heat produced within it is put. Most familiar are the furna...