Perpetual Motion Clock?

[Lornce]

Real perpetual motion isn't possible The Atmos clock can run on nothing for decades. this one has been running on my mantel for 6 years and at my parents place for 25 years before. They use variations in temperature to power them. Inside spring like tubes is a mixture of gases that expand and contract with each temperature change. The mechanism winds naturally, without any human intervention.

https://i.imgur.com/SaEKQGh.jpg

[pikergolf]

Very cool, and a beautiful clock to boot.

[Weedy1]

That's cool. Checked out this video explaining the same clock:

https://www.youtube.com/watch?v=Ol_dtXvD-p0