An armature made of steel or having a steel core to which permanent magnetism has been imparted. Such are used in some forms of magneto current generators, and in telegraphic instruments. (See Relay, Polarized.)

Spaces or recesses in armatures provided for the reception of the coils.

An armature for an electro-magnet mounted on a pivot, which is at right angles to the yoke or parallel with the legs of the magnet, so as to be free to rotate. When the magnet is excited the armature is drawn into line or approximately so with its base or yoke. The system is used [...]

An armature of a dynamo or motor on which the coils are not joined in one closed circuit, but have their ends or some of them separated, and connected each to its own commutator bar or each set to their own bar.

The inner and outer tin-foil coatings of a Leyden jar or other condenser.

Pieces of paper pasted on the stationary plate of an electric machine of the Holtz type.

An armature of a magnet or telegraph relay which is not polarized or magnetized. Synonym–Non-polarized Armature–Neutral Relay Armature.

An armature in which a number of poles greater than two is determined by the field. A multipolar field is employed for its production.

The circumflux, q. v., of the armature, or the ampere turns of the same. The maximum load which can be carried by an armature without sparking is directly proportional to the radial depth of core and to the length of the gap, and inversely proportional to the breadth of the polar span.

A limit to the ampere turns permissible on a given armature is found in the increase of cross magnetizing effect, q. v., the increased lead necessitated, and the growth of the demagnetizing power. All such perturbing effects are sometimes expressed as armature interference.