Columbia Encyclopedia

Search results

500 results found

ballistics

(Encyclopedia)ballistics bəlĭsˈtĭks [key], science of projectiles. Interior ballistics deals with the propulsion and the motion of a projectile within a gun or firing device. Its problems include the ignition a...

Randolph, Edmund

(Encyclopedia)Randolph, Edmund, 1753–1813, American statesman, b. Williamsburg, Va.; nephew of Peyton Randolph. He studied law under his father, John Randolph, a Loyalist who went to England at the outbreak of th...

Timor

(Encyclopedia)Timor tēˈmôr [key] [Malay,=east], island (1990 est. pop. 3,900,000), c.13,200 sq mi/34,200 sq km, largest and easternmost of the Lesser Sundas, in the Malay Archipelago. Timor is divided politicall...

vibration

(Encyclopedia)vibration, in physics, commonly an oscillatory motion—a movement first in one direction and then back again in the opposite direction. It is exhibited, for example, by a swinging pendulum, by the pr...

shock absorber

(Encyclopedia)shock absorber, device for reducing the effect of a sudden shock by the dissipation of the shock's energy. On an automobile, springs and shock absorbers are mounted between the wheels and the frame. W...

Charles Albert

(Encyclopedia)Charles Albert, 1798–1849, king of Sardinia (1831–49, see Savoy, house of). Because he had not been entirely unsympathetic to the revolutionary movement of 1821 in Sardinia, Charles Albert develop...

Chen Duxiu

(Encyclopedia)Chen Duxiu or Ch'en Tu-hsiu both: chŭn do͞o-shyo͞o [key], 1879–1942, Chinese educator and Communist party leader. He was active in the republican revolution of 1911 and was forced to flee to Japa...

chiropractic

(Encyclopedia)chiropractic kīrəprăkˈtĭk [key] [Gr.,=doing by hand], medical practice based on the theory that all disease results from a disruption of the functions of the nerves. The principal source of inter...

Gay-Lussac, Joseph Louis

(Encyclopedia)Gay-Lussac, Joseph Louis zhôzĕfˈ lwē gā-lüsäkˈ [key], 1778–1850, French chemist and physicist. He was professor in Paris at the Sorbonne, at the Polytechnic School, and at the Jardin des Pla...

dengue fever

(Encyclopedia)dengue fever dĕngˈgē, –gā [key], acute infectious disease caused by four closely related viruses and transmitted by the bite of the female Aedes mosquito; it is also known as breakbone fever and...