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echo sounder

(Encyclopedia)echo sounder, an older instrumentation system for indirectly determining ocean floor depth. Echo sounding is based on the principle that water is an excellent medium for the transmission of sound wave...

Kelvin, William Thomson, 1st Baron

(Encyclopedia)Kelvin, William Thomson, 1st Baron, 1824–1907, British mathematician and physicist, b. Belfast. He was professor of natural philosophy at the Univ. of Glasgow (1846–99). He is known especially for...

Sudetes

(Encyclopedia)Sudetes so͞odēˈtēz [key], Czech Sudety, Ger. Sudeten, mountain range, along the border of the Czech Republic and Poland, extending c.185 mi (300 km) between the Elbe and Oder rivers. It is continu...

pharynx

(Encyclopedia)pharynx fârˈĭngks [key], area of the gastrointestinal and respiratory tracts which lies between the mouth and the esophagus. In humans, the pharynx is a cone-shaped tube about 41⁄2 in. (11.43 cm)...

livery companies

(Encyclopedia)livery companies, London trade guilds incorporated by royal charter, deriving their name from the assumption of distinctive dress (livery) by their members. Edward III granted the first charters in th...

sextant

(Encyclopedia)CE5 Sextant sextant, instrument for measuring the altitude of the sun or another celestial body; such measurements can then be used to determine the observer's geographical position or for other n...

cutlery

(Encyclopedia)cutlery, various types of implements for cutting, preparing, and eating food. In addition to different kinds of knives and the steels to sharpen them, the term usually encompasses forks and spoons. Th...

Twenty-one Demands

(Encyclopedia)Twenty-one Demands (1915), instrument by which Japan secured temporary hegemony over China. Japan used its declaration of war against Germany (Aug., 1914) as grounds for invading Kiaochow, the German ...

radio range

(Encyclopedia)radio range, geographically fixed radio transmitter that radiates coded signals in all directions to enable aircraft and ships to determine their bearings. An aircraft or ship can determine its line o...

Oliveros, Pauline

(Encyclopedia)Oliveros, Pauline, 1932–2016, American composer and musician, b. Houston, Tex., studied Univ. of Houston, San Francisco State College (B.A., 1957). She began playing the accordion as a child, and it...