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altitude

(Encyclopedia)altitude, vertical distance of an object above some datum plane, such as mean sea level or a reference point on the earth's surface. It is usually measured by the reduction in atmospheric pressure wit...

engraving

(Encyclopedia)engraving, in its broadest sense, the art of cutting lines in metal, wood, or other material either for decoration or for reproduction through printing. In its narrowest sense, it is an intaglio print...

elevator, in machinery

(Encyclopedia)elevator, in machinery, device for transporting people or goods from one level to another. The term is applied to the enclosed structures as well as the open platforms used to provide vertical transpo...

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...

placebo

(Encyclopedia)placebo pləsēˈbō [key], inert substance given instead of a potent drug. Placebo medications are sometimes prescribed when a drug is not really needed or when one would not be appropriate because t...

Sagan, Carl Edward

(Encyclopedia)Sagan, Carl Edward sāˈgən [key], 1934–96, American astronomer and popularizer of science, b. New York City. Early in his career he investigated radio emissions from Venus and concluded that the c...

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...

Begin, Menachem

(Encyclopedia)Begin, Menachem mĕnäˈkhĕm bāˈgĭn [key], 1913–92, Zionist leader and Israeli prime minister (1977–83), b. Russia. He became (1938) leader of a Zionist youth movement in Poland, where he also...

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...