1. Variation, dip, or magnetic intensity. 2. The part of an instrument producing or influenced by magnetism.


Related Terms

CURLE BALANCE

An instrument for determining the susceptibility of weakly magnetic materials, in which the deflection produced by a strong permanent magnet on a suspended tube containing the specimen is measured.

SHIELD

A metal housing around an electrical or magnetic element to eliminate or reduce the effect of its electric or magnetic field, or to reduce the effect of an exterior field on the element.

AZIMUTH COMPASS

An instrument employed for ascertaining position of the sun with respect to magnetic north.

COMPASS DECLINOMETER

An instrument used for magnetic distribution surveys; employs a thin compass needle 6 inches (15 centimeters) long, supported on a sapphire bearing and steel pivot of high quality; peep sights serve for aligning the compass box on an azimuth mark.

MAGNETOMETER

An instrument for measuring the intensity and direction of the earth’s magnetic field.

MAGNETIC SECULAR CHANGE

The gradual variation in the magnetic element which occurs over a period of years.

CROSSED-FIELD DEVICE

Any instrument crossed-needle meter which uses the motion of electrons in perpendicular electric and magnetic fields to generate microwave radiation, either as an amplifier or oscillator.

VARIOMETER

An instrument for comparing magnetic forces, especially of the earth’s magnetic field.

ISOMAGNETIC

Of or pertaining to lines connecting points of equality in some magnetic element

DECLINOMETER

An instrument for measuring magnetic declination

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