Torsion pendulum clock.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...k_fullsize.jpg
More: https://en.wikipedia.org/wiki/Torsion_pendulum_clock
Previously:
Astro-skeleton clock - photo and video
1820 Congreve clock - GIF
Fibonacci spiral clock - photo
Salisbury Cathedral clock - photo
Bookmarks