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Electro-galvanic ring.

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view Electro-galvanic ring.


Attribution 4.0 International (CC BY 4.0)
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Credit: Electro-galvanic ring. Credit: Wellcome Collection. Attribution 4.0 International (CC BY 4.0)

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Electro-galvanic ring; with an outer circuit of zinc, and an inner circuit of copper.



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