Late 19th Century French Portico Clock
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A French portico clock, late 19th century, in ebonised wood with boxwood inlay, the enamel dial with Roman numerals set within an ornately cast bezel and supported between spiral twist columns with cast capitals and bases, with key and elaborately cast pendulum, height 44.56 cm, width 13 cm, depth 13 cm
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- Boxwood - Boxwood is a hard, yellow coloured, close grained timber. In the 19th century it was often used for inlays, especially stringing, because of its contrasting colour to the darker timbers of the carcase. Stringing is the inlay of a narrow strip of veneer of a lighter colour, such as boxwood along or close to the edges of an object that has been veneered in a darker timber such as mahogany.
Because of its fine grain and resistnce to splitting or chipping it has also been used for treen, turnings, carvings and other small wooden items, such as chess pieces. - Bezel - On a clock or watch, the bezel is the metal frame into which the watch or clock glass is fitted. In clocks, the bezel may include a hinge and a flange, in effect a door to the face of the clock. In jewellery the bezel is a band of metal with a projecting lip that holds the gemstone in its setting.
- 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.
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