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quadrant

Overview page. Subjects: Medieval and Renaissance History (500 to 1500).

A mathematical instrument (type of sector) which measures angles of elevation or depression by means of a weighted plumb line on a 90° arc of a circle, used in astronomy ...

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quadrant

Christopher Clapham and James Nicholson.

in The Concise Oxford Dictionary of Mathematics

January 2014; p ublished online September 2014 .

Reference Entry. Subjects: Pure Mathematics. 75 words.

In a Cartesian coordinate system in the plane, the axes divide the rest of the plane into four regions called quadrants. By convention, they are usually numbered as follows: the first...

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quadrant

Overview page. Subjects: Dentistry.

(in statistics)

One half of each dental arch. The four quadrants are referred to as upper right, upper left, lower left, and lower right, with the dividing line being the midpoint...

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quadrant

Overview page. Subjects: Architecture — Mathematics.

In a Cartesian coordinate system in the plane, the axes divide the rest of the plane into four regions called quadrants. By convention, they are usually numbered as follows: the first...

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quadrant electrometer

Andrew Butterfield and John Szymanski.

in A Dictionary of Electronics and Electrical Engineering

June 2018; p ublished online June 2018 .

Reference Entry. Subjects: Electronic Engineering. 177 words.

An *electrometer that consists of a flat cylindrical metal box formed from individually isolated quadrantal segments and containing a light foil-covered vane that is supported by a quartz...

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seaman's quadrant

Edited by I. C. B. Dear and Peter Kemp.

in The Oxford Companion to Ships and the Sea

January 2006; p ublished online January 2007 .

Reference Entry. Subjects: Maritime History. 328 words.

often called the simple quadrant, the earliest instrument used by navigators for measuring the altitude of a heavenly body.

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Davis's quadrant

Mike Richey.

in The Oxford Companion to Ships and the Sea

January 2006; p ublished online January 2007 .

Reference Entry. Subjects: Maritime History. 500 words.

named by the French the English quadrant. John Davis (c.1550–1605), the illustrious English navigator and explorer of

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seaman's quadrant

Overview page. Subjects: Maritime History.

Often called the simple quadrant, the earliest instrument used by navigators for measuring the altitude of a heavenly body. It was in the form of a quarter circle of brass or wood with a...

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quadrant excavation

Overview page. Subjects: Archaeology.

[Me]

A system of excavating circular or near‐circular archaeological sites and features such as round barrows, ring cairns, pits, or round houses where the entity to be examined is...

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Davis's quadrant

Overview page. Subjects: Maritime History.

Named by the French the English quadrant. John Davis (c.1550–1605), the illustrious English navigator and explorer of Elizabethan times who mounted three voyages in search of the North-West...

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quadrant n. (in statistics)

Edited by Robert Ireland.

in A Dictionary of Dentistry

January 2010; p ublished online January 2010 .

Reference Entry. Subjects: Dentistry. 36 words.

One half of each dental arch. The four quadrants are referred to as upper right, upper left, lower left, and

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quadrantic hemianopsia n.

Andrew M. Colman.

in A Dictionary of Psychology

January 2008; p ublished online January 2009 .

Reference Entry. Subjects: Psychology. 30 words.

Loss of vision for one quadrant of the visual field, usually associated with a lesion in optic radiations from a

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quadrantic hemianopsia n.

Andrew M. Colman.

in A Dictionary of Psychology

January 2015; p ublished online May 2015 .

Reference Entry. Subjects: Psychology. 30 words.

Loss of vision for one quadrant of the visual field, usually associated with a lesion in *optic radiations from

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Hadley's reflecting quadrant

Edited by I. C. B. Dear and Peter Kemp.

in The Oxford Companion to Ships and the Sea

January 2006; p ublished online January 2007 .

Reference Entry. Subjects: Maritime History. 140 words.

the replacement of the far less accurate Davis's quadrant for taking a sight for the purposes of celestial navigation.

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Hadley's reflecting quadrant

Overview page. Subjects: Maritime History.

The replacement of the far less accurate Davis's quadrant for taking a sight for the purposes of celestial navigation. It was invented by the English mathematician and scientist John Hadley...

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The Empty Quadrant

Eric Hayot.

in On Literary Worlds

November 2012; p ublished online January 2013 .

Chapter. Subjects: Literary Studies (20th Century onwards). 836 words.

This chapter considers the possibility of a fourth quadrant in the matrix defining the modal responses to any dominant world-view. That empty square, which would be the paradoxical site of...

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quadrant

Overview page. Subjects: Medieval and Renaissance History (500 to 1500).

A mathematical instrument (type of sector) which measures angles of elevation or depression by means of a weighted plumb line on a 90° arc of a circle, used in astronomy ...

See overview in Oxford Index

Quadrant

Overview page. Subjects: Literary Studies (20th Century onwards).

A journal of the Australian Association for Cultural Freedom (part of the International Congress for Cultural Freedom, an anti-communist organ of the 1950s). It was established in 1956...

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QUADRANT

Overview page. Subjects: Second World War.

Codename for the first Quebec conference held from 17 to 24 August 1943 to discuss future Allied strategy (see Grand Alliance). Churchill, Roosevelt, and their diplomatic and military...

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quadrant

James Stevens Curl.

in A Dictionary of Architecture and Landscape Architecture

January 2006; p ublished online January 2006 .

Reference Entry. Subjects: Architecture. 133 words.

1 The fourth part of a circle, hence an object or a street with a plan-form based on a fourth

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quadrant

Ian Ridpath.

in A Dictionary of Astronomy

January 2012; p ublished online January 2012 .

Reference Entry. Subjects: Astronomy and Astrophysics. 50 words.

An obsolete navigational instrument used for measuring angles. It consisted of an engraved arc of a quarter of a circle,

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