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Grenet electric cell, 1870.

Grenet electric cell, 1870.
4 0 c m
actual image size: 28cm x 32cm


Bichromate cells such as this could be joined together to make a battery. The plates of carbon and zinc react with the chromic acid in the glas jar, transferring a stream of electrons from the zinc to the carbon.

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© Science Museum / Science & Society Picture Library

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