Electromagnetic horn - Armature

From International Dictionary of Marine Aids to Navigation
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Armature (in an electromagnetic horn)

That part of the magnetic circuit which is free to move under the action of the magnetic field and whose motion is imparted to the diaphragm.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM