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

VERTICAL INTENSITY OF THE EARTH’S MAGNETIC FIELDThe strength of the vertical component of the earth’s magnetic field. 
MAGNETIC INTENSITYThe strength of a magnetic field. Also called MAGNETIC FORCE. 
ELECTROMAGNETIC INDUCTIONThe production of electromotive force (EMF) in a conductor through relative motion of a conductor and a magnetic field, or by the change in the strength of magnetic flux around the conductor. 
MAGNETIC DIPAngular distance between the horizontal and the direction of a line of force of the earth’s magnetic field at any point. Also called DIP, MAGNETIC INCLINATION. 
SHIELDING FACTORThe 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. 
ATTENUATION

ELASTIC HYSTERESISPhenomenon exhibited by some solids in which the deformation of the solid depends not only on the stress applied to the solid but also on the previous history of this stress; analogous to magnetic hysteresis, with magnetic field strength and magnetic induction replaced by stress and strain respectively. 
DEGAUSSINGNeutralization of the strength of the magnetic field of a vessel, using electric coils permanently installed in the vessel. 
COTTON BALANCEA device which employs a currentcarrying conductor of special shape to determine the strength of a magnetic field. 
MAGNETIC DIRECTIONHorizontal direction expressed as angular distance from magnetic north. magnetic diurnal variation. Oscillations of the earth’s magnetic field which have a periodicity of about a day and which depend to a close approximation only on local time and geographic latitude. Also called MAGNETIC DAILY VARIATION. 
MarineProHelp 2018.