Magnetic Intensity.
The intensity of the magnetization of a body. It is measured by the
magnetic lines of force passing through a unit area of the body, such
area being at right angles to the direction of the lines of force.
Magnetic Lag.
In magnetism the tendency of hard iron or steel especially to take up
magnetism slowly, and to part with it slowly. (See Magnetic Inertia.)
The lag affects the action of a dynamo, and is a minor cause of those
necessitating the lead of the brushes.
Synonym--Magnetic Retardation.
Magnetic Latitude.
Latitude referred to the magnetic equator and isoclinic lines.
Magnetic Leakage.
The lines of force in a field magnet which pass through the air and not
through the armature are useless and represent a waste of field. Such
lines constitute magnetic leakage.
Magnetic Limit.
The temperature beyond which a paramagnetic metal cannot be magnetized.
The magnetic limit of iron is from a red to a white heat; of cobalt, far
beyond a white heat; of chromium, below a red heat; of nickel at about
350° C. (662°F.) of manganese, from 15° C. to 20° C. (59° to 68° F.)
Magnetic Lines of Force.
Lines of force indicating the distribution of magnetic force, which is
due presumably to whirls of the ether. A wire or conductor through which
a current is passing is surrounded by an electro-magnetic field of
force, q. v., whose lines of force form circles surrounding the
conductor in question. A magnet marks the existence of a similar
electro-magnetic field of force whose lines form circuits comprising
part of and in some places all of the body of the magnet, and which are
completed through the air or any surrounding paramagnetic or diamagnetic
body. They may be thought of as formed by the Ampérian sheet of current,
and analogous to those just mentioned as surrounding a conductor.
Fig. 223. MAGNETIC LINES OF FORCE, DIRECTION OF.
A magnetic line of force may be thought of as a set of vortices or
whirls, parallel to each other, and strung along the line of force which
is the locus of their centres.
If as many lines are drawn per square centimeter as there are dynes (per
unit pole) of force at the point in question, each such line will be a
unitary c. g. s. line of force.