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Planisphere Clock:Left dial
Planisphere Clock:Left dial
The left-hand dial is engraved with the numbers one to forty-two. It showed the times of the eclipse of Io, one of the moons of the planet Jupiter. This would have been useful for determining longitude.

Case attributed to Jean-Pierre Latz, furniture worker; movement (now missing) by Alexandre Fortier, clockmaker
French, Paris, 1745 - 1749
Oak veneered with kingwood, mahogany, and bois satiné; bronze mounts; brass dials
H: 9 ft. 3 in. x W: 3 ft. 1 in. x D: 1 ft. 3 in.