The State of the Unit: a documentary film about the redefinition of the kilogram


The collection of scientific instruments at the Musée des Arts et Métiers (Paris, France) includes a few decimal clocks and pocketwatches.

When filming the kilogram and meter standards, I learned about decimal time from Dr. Lalande, who is a curator of scientific instruments at the Musée. His section includes some decimal clocks made in the 1790s.

Some of the timepieces show 10 hours and their subdivisions only; others also include duodecimal time markings. This is part of the 24-hour face of a clock.