The quantity obtained by multiplying the distance between two magnetic poles by the average strength of the poles.

Related Terms


Neutralization of the strength of the magnetic field of a vessel, using electric coils permanently installed in the vessel.


The strength of a magnetic field. Also called MAGNETIC FORCE.


  1. A lessening in amount, particularly the reduction of the amplitude of a wave with distance from the origin. 2. The decrease in the strength of a radar wave resulting from absorption, scattering, and reflection by the medium through which it passes (wave guide, atmosphere) and by obstructions in its path. Also attenuation of the wave may be the result of artificial means, such as the inclusion of an attenuator in the circuitry or by placing an absorbing device in the path of the wave.


The strength of the vertical component of the earth’s magnetic field.


The strength of a magnetic field. Also called MAGNETIC INTENSITY.


A material used to prevent, dissolve, or facilitate removal of oxides and other undesirable surface substances. Also, the measure of the quantity of magnetism, taking into account the strength and extent of the magnetic field.

Functions Of Fluxes

Continuity of grain structure across a soldered or welded joint can only be obtained if the metals are brought into atomic contact, and this is not possible if the metals are coated with oxide layers, grease, corrosion products or other surface films. Mechanical cleaning can only remove the bulk of such surface films, some form of chemical cleaning being necessary to complete the cleaning operation. Fluxes perform some or all of the following functions:

They chemically clean the surfaces to be joined,

They prevent the formation of new oxide layers during the heating cycle of the joining process,

They assist the filler metal to run freely into the joint, and

They assist the "wetting" process by which surfaces alloying occurs.


A device which employs a current-carrying conductor of special shape to determine the strength of a magnetic field.


The derived unit of magnetic field strength in the International System of Units


A centimeter-gramsecond system of electric and magnetic units in which the unit of charge is that charge which exerts a force of 1 dyne on another unit charge when separated from it by a distance of 1 centimeter in vacuum; other units are derived from this definition by assigning unit coefficients in equations relating electric and magnetic quantities. Abbreviated esu.


The ratio of the strength of the magnetic field at a compass to the strength if there were no disturbing material nearby; usually expressed as a decimal. Because of the metal of a vessel, the strength of the earth’s magnetic field is reduced somewhat at a compass location aboard ship. The shielding factor is one minus the percentage of reduction.

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