

Fedchenko's astronomical clock with an isochronal pendulum.
- Categories: Science & Technology
- Location: Russia
- Event date: 01.03.1965
- Date published: 16.06.2010
- Author: Nikolai Pashin
- Credit: Sputnik
- Source: Sputnik
- Original: A208314, 6x4,5 film
- Media: JPEG, 3544x9844px, 4Mb