The Oxford Electric Bell in December 2009Charged by the two piles, the clapper moves back and forth between the two bells.
The Oxford Electric Bell or Clarendon Dry Pile is an experimental electric bell, in particular a type of bell that uses the electrostatic clock principle that was set up in 1840 and which has run nearly continuously ever since. It was one of the first pieces purchased for a collection of apparatus by clergyman and physicist Robert Walker.[1][2] It is located in a corridor adjacent to the foyer of the Clarendon Laboratory at the University of Oxford, England, and is still ringing, albeit inaudibly due to being behind two layers of glass.
^"Walker, Robert". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/38098. (Subscription or UK public library membership required.)
^"Exhibit 1 – The Clarendon Dry Pile". Department of Physics. Oxford University. Retrieved 30 January 2021.
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