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wind shear

(Encyclopedia)wind shear, a sudden, drastic change in wind direction or speed over a comparatively short distance. Most winds travel horizontally, as does most wind shear, but under certain conditions, including th...

air traffic control

(Encyclopedia)air traffic control, the system by which airplanes are safely routed into and out of major airports. Air traffic control in the United States is centered in a number of regional control centers that r...

catamaran

(Encyclopedia)catamaran kătˌəmərănˈ [key], watercraft made up of two connected hulls or a single hull with two parallel keels. Originally used by the natives of Polynesia, the catamaran design was adopted by ...

eclipse

(Encyclopedia)CE5 A. Lunar eclipse B. Solar eclipse eclipse ēklĭpsˈ, ĭ– [key] [Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lu...

lake, body of water

(Encyclopedia)lake, inland body of standing water occupying a hollow in the earth's surface. The study of lakes and other freshwater basins is known as limnology. Lakes are of particular importance since they act a...

Queensberry, John Sholto Douglas, 8th marquess of

(Encyclopedia)Queensberry, John Sholto Douglas, 8th marquess of, 1844–1900, British nobleman, originator of the code of rules that governs modern boxing. He served in the British army and navy and later was a mem...

Declaration of Independence

(Encyclopedia)Declaration of Independence, full and formal declaration adopted July 4, 1776, by representatives of the Thirteen Colonies in North America announcing the separation of those colonies from Great Brita...

Daniel, book of the Bible

(Encyclopedia)Daniel, book of the Bible. It combines “court” tales, perhaps originating from the 6th cent. b.c., and a series of apocalyptic visions arising from the time of the Maccabean emergency (167–164 b...

transmission

(Encyclopedia)transmission, in automobiles, system of parts connecting the engine to the wheels. Suitable torque, or turning force, is generated by the engine only within a narrow range of engine speeds, i.e., rate...

3D printer

(Encyclopedia)3D printer, computerized device that produces a three-dimensional object by creating it as a series of thin layers. The object is created from a model stored in computer-aided design file; the model i...