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Perth, town, Scotland

(Encyclopedia)Perth, town (1991 pop. 41,916), Perth and Kinross, central Scotland, on the Tay River. It was called St. Johnstoun until the 17th cent. Perth is famous for its dye works and cattle markets. Other indu...

Piltdown man

(Encyclopedia)Piltdown man, name given to human remains found during excavations (1908–15) at Piltdown, Sussex, England, by Charles Dawson. The find led to much speculation and argument. Since they were found wit...

Yuma, city, United States

(Encyclopedia)Yuma yo͞oˈ mə [key], city (1990 pop. 54,923), seat of Yuma co., extreme SW Ariz., on the eastern bank of the Colorado River near the confluence of the Gila River; founded 1854, inc. as a city 1914....

Waco

(Encyclopedia)Waco wāˈkō [key], city (1990 pop. 103,590), seat of McLennan co., E central Tex., on the Brazos River, just below the mouth of the Bosque; inc. 1856. It is a rail junction and a trading, shipping, ...

welding

(Encyclopedia)welding, process for joining separate pieces of metal in a continuous metallic bond. Cold-pressure welding is accomplished by the application of high pressure at room temperature; forge welding (forgi...

Celsius temperature scale

(Encyclopedia)Celsius temperature scale sĕlˈsēəs [key], temperature scale according to which the temperature difference between the reference temperatures of the freezing and boiling points of water is divided ...

geometry

(Encyclopedia)geometry [Gr.,=earth measuring], branch of mathematics concerned with the properties of and relationships between points, lines, planes, and figures and with generalizations of these concepts. Eucli...

crystal

(Encyclopedia)CE5 Types of crystal crystal, a solid body bounded by natural plane faces that are the external expression of a regular internal arrangement of constituent atoms, molecules, or ions. The formation...

interstellar matter

(Encyclopedia)interstellar matter, matter in a galaxy between the stars, known also as the interstellar medium. The interstellar gas, which constitutes about 99% of the interstellar matter, consists mostly of hyd...

Saint-Malo

(Encyclopedia)Saint-Malo săN-mälōˈ [key], town (1990 pop. 49,274), Ille-et-Vilaine dept., NW France, on the English Channel. Built on a rocky promontory, Saint-Malo is a fishing port and one of the great touris...