French Marquetry Portico Clock with Ormolu Mounts
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French ebony, marquetry and ormolu mounted portico clock, 19th century, the circular ormolu dial with Roman numerals contained within a portico with a rectangular pediment decorated with marquetry and string inlay, supported by four Doric columns atop a rectangular base with carved detailing and marquetry, pendulum (A/F), height 49 cm width 27 cm depth 17 cm. Provenance: The collection of Dr. Henry Mackellar Michelmore, Sydney
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- 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.
- A/f, as Inspected - The letters "A/F" or "as inspected" as part of a description is the cataloguer's shorthand for "all faults" or "as found", meaning the item has some type of damage or deficiency, it is of uncertain date or provenance, and/or that the seller takes no responsibility for the completeness of the item or the accuracy of the description.
- 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.
- 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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