Localised unusual magnetic error.
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ARMATURE DEMAGNETIZATION
The reduction in the effective magnetic lines of force, produced by the armature current.
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AIR GAP
The space between magnetic poles, or between the rotating and stationary assemblies in a motor or generator.
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HALVING
The process of adjusting magnetic compass correctors so as to remove half of the deviation on the opposite cardinal or adjacent intercardinal headings to those on which adjustment was originally made when all deviation was removed. This is done to equalize the error on opposite headings.
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HEELING MAGNET
A permanent magnet placed vertically in a tube under the center of a marine magnetic compass, to correct for heeling error.
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GRID MAGNETIC ANGLE
Angular difference in direction between grid north and magnetic north. It is measured east or west from grid north. Grid magnetic angle is sometimes called GRID VARIATION or GRIVATION.
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HEELING ADJUSTER
A dip needle with a sliding weight that can be moved along one of its arms to balance magnetic force, used to determine the correct position of a heeling magnet.
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HEELING ERROR
The change in the deviation of a magnetic compass when a craft heels, due to the change i
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MAGNETIC BEARING
A type of bearing in which the force that separates the relatively moving surfaces is produced be a magnetic field.
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MAGNETIC FIELD
The region within which a body or current experiences magnetic force.
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INDUCED MAGNETISM
The magnetism acquired by soft iron while it is in a magnetic field. Soft iron will lose its induced magnetism when it is removed from a magnetic field. The strength and polarity of the induced magnetism will alter immediately as its magnetic latitude, or its orientation in a magnetic field, is changed. The induced mag- netism has an immediate effect upon the magnetic compass as the magnetic latitude or heading of a craft changes.
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