Drum armature
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“The drum armature differs from the shuttle armature chiefly in that it employs many coils instead of one. The cylindrical iron core is made of thin disks of soft iron in insulated from each other, thus minimizing the ‘local currents’ and the heating effects thereof.” — Avery, 1895
Source
Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 491
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