Electric battery feeds the bell for 175 years in a row

The Clarendon Laboratory at Oxford University is an amazing gimmick: the electric bell , which has been running for 175 years in a row. The source of electricity for him is the so-called. " Dry battery ". This early form of electrostatic battery was invented by Giuseppe Zamboni in 1812.

Zamboni used alternating discs of silver foil, zinc foil and paper in his batteries. The discs are collected in a compressed stack of several hundred pieces and are enclosed inside a glass flask. These batteries give a very small current. Interestingly, they were used until the 1980s, mainly as portable sources for military purposes. For example, during World War II they were used on infrared telescopes.

However, what exactly is the battery that feeds the Oxford bell for so long is unknown - scientists do not want to disassemble it while it is working. The explanatory note of the manufacturers of the call, the company Watkin and Hill, reports that this device was launched in 1840 (although some researchers argue about the existence of evidence dating back to her already in 1825).
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Now the battery current is already measured in nanoamperes, so the sound of a small oscillating bell cannot be caught by the human ear - one can only observe its small oscillations between two bells. One of the researchers, A.Dzh. Croft, who wrote a scientific paper on the call in 1984, even thinks that the bell can physically wear out before the battery runs out of charge. Anyway, everything ever ends - and at the end of this experiment we will be able to find out what is inside the battery.