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An important example of late 18th century French precision clock making. The regulator incorporates a superb gridiron pendulum, visible through the trunk door, to compensate for the effect of changing temperature.
The clock employs a remontoire, a device rewound by the mainspring at short intervals to deliver constant force to the train, eliminating the possibility of diminished power from the unwinding of the coiled spring.
The clock has two minute hands to correctly displays true Solar Time as seen on a sundial in addition to the Mean Time measured by a mechanical clock by using an "Equation of Time" cam linked to the additional hand. Not incidentally, Julian LeRoy, a leading French clockmaker of the mid-18th century declared that the ability to make an equation clock was the true test of a master clockmaker.
Solar time varies constantly throughout the year requiring a calendar mechanism in the clock. The silvered calendar wheel is visible at the top of the trunk door. The equation cam can be seen behind it.
Finally, the calendar displays both the conventional months of the year and the months of the French Republican calendar. Also commonly called the French Revolutionary calendar, the calendar was created and implemented during the French Revolution, and used by the French government for about 12 years from late 1793 to 1805, and for 18 days by the Paris Commune in 1871.