URBAN JURGENSEN DECK CHRONOMETER Urban Jürgensen, No. 56. Made circa 1812.
Exceptionally fine and rare large silver free-sprung deck
Chronometer with helical gold balance spring, and regulator
dial in original three-tier fitted mahogany box.
Four-body, "Consular", with hinged silver cuvette,
polished, back with winding aperture.Box: three-tier, four
sided spring mounted bowl, lock in front.
White enamel, radial Roman hour chapter at 10 o'clock,
symmetrically to the right minute chapter with fifteen-minute
Arabic markers, subsidiary seconds. Blued steel "spade
and poker" hands.
55.8 mm.(24'''), gilt brass half plate, slightly conical
pillars, fusee and chain with Harrison's maintaining power,
Arnold spring detent Chronometer escapement, two-arm
cut compensation balance with sliding wedge temperature
adjustment weights and mean-time/poising screws, gold
helical balance spring with terminal curves, jeweled to the
third wheel, diamond endstone on the balance staff, large
motion train between hour and minute subsidiary dials.