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/sˈɛktər/ Listen

noun

Sector n.

(Geom.) A part of a circle comprehended between two radii and the included arc.

A mathematical instrument, consisting of two rulers connected at one end by a joint, each arm marked with several scales, as of equal parts, chords, sines, tangents, etc., one scale of each kind on each arm, and all on lines radiating from the common center of motion. The sector is used for plotting, etc., to any scale.

An astronomical instrument, the limb of which embraces a small portion only of a circle, used for measuring differences of declination too great for the compass of a micrometer. When it is used for measuring zenith distances of stars, it is called a zenith sector.

Dip sector, an instrument used for measuring the dip of the horizon.

Sector of a sphere, or Spherical sector, the solid generated by the revolution of the sector of a circle about one of its radii, or, more rarely, about any straight line drawn in the plane of the sector through its vertex.

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Etymology of 'Sector'

Collaborative International Dictionary of English 0.48

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"Sector" Quotes from Famous Books

... system of wheels. An axle, set in motion by the latter, revolves one way or the other, according to the direction of the telescope's motions. This axle is provided with an endless screw that gears with a toothed sector, and the latter controls the rotatory axis of the alidade. The elements of the toothed wheels and the number of revolutions of the armature for a given displacement of the telescope being properly calculated, it will ...

— Scientific American Supplement, No. 363, December 16, 1882 • Various

... a nice round hand, like a boy's hand. He knew Spanish, and enough English. For the sector that was assigned to him he would not need a map. He knew it better than anyone else, certainly better than any mapmaker. Besides, he was poor and ...

— Sodom and Gomorrah, Texas • Raphael Aloysius Lafferty

... settlement at Manchester as a mechanical engineer, would occupy more space than we can well spare. But we may briefly mention a few of the more important. In 1816, while carrying on business on his own account in Deansgate, he invented his improved sector for correctly sizing wheels in blank previously to their being cut, which is still extensively used. In the same year he invented his improved screw-lathe; and in the following year, at the request of the boroughreeve and constables ...

— Industrial Biography - Iron Workers and Tool Makers • Samuel Smiles

... units of the southern sector was effected on the night of Dec. 22. The Meerut Division remained under the orders of the First Corps, and was not ...

— New York Times Current History: The European War, Vol 2, No. 1, April, 1915 - April-September, 1915 • Various

... who gained even greater notoriety than Slade was "Wild Bill" Hickock, a tall, yellow-haired giant who had done splendid service as a scout in the western sector of the ...

— An Autobiography of Buffalo Bill (Colonel W. F. Cody) • Buffalo Bill (William Frederick Cody)

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