Like this battery which has been working for past 176 years and no one knows the reason how.
Clarendon Dry Pile is one of the first types of electric batteries.
In the case of the Oxford Bell battery, the making of the piles inside the battery is unknown.
Writing about it in 1984, A.J.
Thats when the bell will stop ringing and we will be able to examine the inner workings more closely.
Heres a video:
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source: www.techworm.net