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In a laboratory at Oxford University sits the Oxford Electric Bell, which has spent 176 years constantly ringing. And no-one's quite sure what the battery that powers it is made of...
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Thanks to camera operator Mikayla Hunter: https://www.youtube.com/channel/UCvv5I_zxSDPFHry1Oexf6pg
And thanks to the University of Oxford's Physics Department for letting us film the bell!
Croft (1984) The Oxford electric bell, Eur. J. Phys.
Croft (1985) The Oxford dry pile, Clarendon Laboratory Historical Notes No. 3
The Clarendon Dry Pile, Department of Physics website