On 22/08/2020 18:39, Max Demian wrote:
On 22/08/2020 17:27, harry wrote:
https://www.youtube.com/watch?v=_QLEERYS5C8

Flywheels aren't the only mechanical batteries available. There are
gravity based batteries like the "accumulators" used to work the
bascules of Tower bridge.

Or maybe not...
https://www.bbc.co.uk/news/uk-england-london-53877433

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Jeff