Columbia Encyclopedia

(Encyclopedia)  CE5 Electrodynamic loudspeaker loudspeaker or speaker, device used to convert electrical energy into sound. It consists essentially of a thin flexible sheet called a diaphragm that is made to vibr...

(Encyclopedia) hysteresis hĭsˌtərēˈsĭs [key], phenomenon in which the response of a physical system to an external influence depends not only on the present magnitude of that influence but also on the previous...

(Encyclopedia) Boisbaudran, Paul Émile Lecoq de pôl āmēlˈ ləkôkˈ də bwäbōdräNˈ [key], 1838–1912, French discoverer of the elements gallium, samarium, and dysprosium. He also made contributions in the ...

(Encyclopedia) Ferraris, Galileo gälēlāˈō fār-räˈrēs [key], 1847–97, Italian physicist and electrical engineer. He is noted for his work on alternating current and for his discovery (1885) of the rotary m...

(Encyclopedia) Fort Bragg, U.S. army base, 11,136 acres (4,507 hectares), E N.C., N of Fayetteville; est. 1918. Originally an artillery post, it is now the principal U.S. army airborne-training center and the site o...

(Encyclopedia) Silvanus, in Roman religion, ancient pastoral deity, protector of uncultivated lands. It was also said that he was the guardian of field boundaries, flocks, and herds. Like the Greek Pan, with whom he...

(Encyclopedia) Trinity Bay, inlet of the Atlantic Ocean, 80 mi (129 km) long, SE Newfoundland, N.L., Canada, between the Avalon Peninsula and the mainland. With its small waterfront settlements, it preserves somethi...

(Encyclopedia) Garland, city (2020 pop. 246,018), Dallas co., N Tex., a suburb of Dallas; inc. 1891. Since World War II, Garland has grown from an agricultural communi...

(Encyclopedia) rugby, game that originated (1823), according to tradition, on the playing fields of Rugby, England. It is related to both soccer and American football. The game is said to have started when a Rugby S...

(Encyclopedia) Dubawnt Lake do͝obôntˈ [key], one of the largest lakes of Canada, c.1,600 sq mi (4,140 sq km), in S Nunavut Territory. The Dubawnt River flows through it. Located north of the tree line, the lake i...