An early type of Siemens' Self Exciting dynamo (1873) with drum-wound armature and bar commutator.

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    Licence: Attribution 4.0 International (CC BY 4.0)

    Credit: An early type of Siemens' Self Exciting dynamo (1873) with drum-wound armature and bar commutator. Wellcome Collection. Source: Wellcome Collection.

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