Pole, Salient.
In dynamo and motor field magnets, salient poles are those projecting
from the base or main body of the field magnet, as distinguished from
consequent poles formed by coils wound on the main body itself.
Fig. 268. SALIENT POLES OF FIELD MAGNET.
Poles, Compensating.
A device for avoiding the cross-magnetizing effect on the commutator
core due to the lead of the brushes. It consists in maintaining a small
bar electro-magnet perpendicularly between the pole pieces. This
compensates the cross-magnetizing effect.
Poles of Intensity.
The locus of highest magnetic force on the earth's surface. One such
pole is in Siberia, another is about lat. 52° N., long. 92° W.
[Transcriber's note: 52° N., long. 92° W is about 250 miles Northeast of
Winnipeg.]
Poles of Verticity.
The magnetic poles of the earth. (See Magnetic Poles.)
Pole Tips.
The extreme ends of the expanded poles of a field magnet. In some
machines some of the pole tips are made of cast iron, to alter the
distribution of the lines of force and resulting magnetic pull upon the
armatures. This is done to take off the weight of the armature from its
bearings.
Pole, Traveling.
A term applied to the poles produced in the action of a rotatory field,
whose poles constantly rotate around the circle of the field. (See
Field, Rotatory.)