Antique French Empire Clock with Rare Thirty Day Jump Calendar

Radant fine and attractive antique French Empire clock under…
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Radant fine and attractive antique French Empire clock under glass dome, black and white marble case with fine ormolu mounts, one piece convex enamel dial with Arabic numerals and rare thirty day jump calendar hand (introduced for a short period during the French Revolution), the dial signed 'Radant a Paris', eight day time and bell striking movement with silk suspension pendulum and outside count wheel. Radant was active in Paris from 1807 until 1812. The clock 36 high, 49 cm high overall

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  • Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
  • Pendulum - The pendulum was discovered around 1602 by Galileo Galilei, and was adopted for time keeping by the Dutch mathematician and natural philosopher, Christiaan Huygens, who excelled in astronomy, physics, and horology.

    The pendulum comprises a metal rod usually of brass or steel with a metal disk, known as a bob, at the end. The movement of the pendulum is driven by weights or a spring, and as a pendulum swings in a regular arc, it was found accuracy could be controlled to within a few seconds a week.

    Timekeeping can be adjusted by changing the height of the bob on the rod, making the pendulum either swing slower or faster.

    The disadvantage of the pendulum was that changes in temperature also changed the length of the pendulum, interfering with the accuracy of the clock, and so in the 18th century two types of mercurial pendulums were invented which countered the movement in the steel rod.

    The pendulum was the world's most accurate timekeeping technology until the invention of the quartz clock, regulated by a quartz crystal, in 1927.
  • Ormolu - Ormolu was popular with French craftsmen in the 18th and 19th century for ornamental fittings for furniture, clocks and other decorative items. True ormolu is gilt bronze, that is bronze that has been coated with gold using a mercury amalgam. Due to the health risks associated with using mercury, this method of creating ormolu was discontinued in France in the 1830s. A substitute was developed consisting of about 75% copper and 25% zinc, however it was inferior to the bronze version. It was often lacquered to prevent it tarnishing.

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