The Oxford Electric Bell, one of the world’s oldest experiments, is powered by a battery working since the 19th century, but no one knows how

A bell that is displayed at the Clarendon Laboratory at the University of Oxford in England has been relentlessly ringing for some 178 years if the math is correct. But don’t worry, no matter how annoying the thought of ringing that never ends, this bell is hardly heard, shielded by quite thick layers of glass. The mysterious Oxford Electric Bell, as the unusual object has been called, is counted among the world’s oldest experiments, though it may not have been an experiment originally. No one seems to be entirely clear…

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