Maker, Ferdinand Berthoud, Paris, France, c. 1785.
Three train pinwheel escapement, 1/2 second gridiron compensated pendulum on
knife edge suspension,
30 second Robin remontoire, full perpetual calendar, epicyclical equation of
time, moon's age and phase, quarter strike on solar time Chime and strike
can be silenced. 25.5"h x 12.25"w x 10.75"d, (65 x 31 x 27.5cm)
Below we examine on a closer basis some of the
complex details of the movement.