19th century French marble clock set a French late 19th century carrera white marble/ blue vein three piece with two side rotundas supported by brass columns, the arch top white marble with a brass insert depicting classical scene, and the sides supported by 8 brass columns the French signed and numbered 8-day movement with a visible front escapement, the white enamel dial with black arabic numerals, comes with key and pendulum height 33 cm, width 33 cm, depth 16 cm
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- 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.
- Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
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