Additional examples are adjusted to the entries in an automated way - we cannot guarantee that they are correct.
In 1872 the drum armature was devised by Hefner-Alteneck.
For a very large power-generation armature several feet in diameter, using a hollow ring armature requires far less metal and is lighter than a solid core drum armature.
Rudolf Eickemeyer, (1831-1895), born in Altenbamberg, noted inventor with several innovations to hat manufacturing, patent for first symmetrical drum armature and iron-clad dynamo, and first employer of Charles Proteus Steinmetz.
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