Late 19th Century French Portico Clock
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A French portico clock, late 19th century. Veneered in ebony with boxwood floral marquetry inlay and four Barley twist columns fitted with cast and gilt capitals, the case now fitted with an associated French 8 day time and strike movement, (bell and pendulum missing). 52 cm high, on stand.
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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. - Ebony - Ebony is a close grained timber, black in colour. It has a fine texture which can be polished to a high gloss, making it suitable for venereering, inlay and stringing and its use as solid timber is resticted to small decorative items and ornamental decoration, such as chess pieces and musical instrument parts. The term "ebonised" means "faux ebony", timber that has been darkened during the polishing process to resemble ebony.
- Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
- 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.
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