Torsion pendulum clock - photo

Torsion pendulum clock.

Fullsize image: https://diqn32j8nouaz.cloudfront.net...k_fullsize.jpg

https://diqn32j8nouaz.cloudfront.net...ulum_clock.jpg


More: https://en.wikipedia.org/wiki/Torsion_pendulum_clock

Previously:

https://www.homemadetools.net/forum/...225#post153958
https://www.homemadetools.net/forum/...686#post143587
https://www.homemadetools.net/forum/...621#post143372
https://www.homemadetools.net/forum/...128#post130266

It's an ATMOS clock...

https://en.wikipedia.org/wiki/Atmos_clock

and derives its power from the atmospheric pressure variations acting on the large bellows-like assembly visible behind the movement. No battery or winding required.