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


Related Terms

ELECTROKINETOGRAPH

An instrument used to measure ocean current velocities based on their electrical effects in the magnetic field of the earth.

BEARING BAR

An instrument for measuring bearings, particularly a device consisting of a slender bar with a vane at each end, and designed to fit over a central pivot in the glass cover of a magnetic compass. See also AZIMUTH BAR.

MASS SPECTROSCOPE

An instrument used for determining the masses of atoms or molecules, in which a beam of ions is sent through a combination of electric and magnetic fields so arranged that the ions are deflected according to their masses.

DECLINOMETER

An instrument for measuring magnetic declination

DIP NEEDLE

A magnetic needle suspended so as to be free to rotate about a horizontal axis. An instrument using such a needle to measure magnetic dip is called a DIP CIRCLE. A dip needle with a sliding weight that can be moved along one of its arms to balance the magnetic force is called a HEELING ADJUSTER.

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.

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.

ISOPORIC CHART

A chart with lines connecting points of equal annual rate of change of any magnetic element

HORIZONTAL MAGNETOMETER

A measuring instrument for ascertaining changes in the horizontal component of the magnetic field intensity.

GALVANOMETER

An instrument for measuring the magnitude of a small electric current or for detecting the presence or direction of such a current by means of motion of an indicator in a magnetic field.

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