Jean-Francois Deniere (1774-1866), Deniere et Matelin, antique French bronze mantle clock and garnitures, the clock mounted with two putti beside a central drum movement, has two keys and pendulum, clock approx 38 cm high, 50 cm wide, 14 cm deep (3).
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- Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
- Putto / Putti / Amorino / Amorini - A putto (plural: putti) or amerino (plural: amerini) is a cherub or cupid frequently appearing in both mythological and religious paintings and sculpture, especially of the Renaissance and Baroque periods and later used as a decorative element in the design of furniture, ceramics, statuary etc. They are usually depicted as chubby males, or of indeterminate gender, often with wings. Their depiction may represent an association with love, heaven, peace or prosperity.
- 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.
- Bronze - An alloy of copper and tin, traditionally in the proportions of about 9 parts of copper to 1 part of tin.
The discovery of bronze in Western Asia in the 4th century enabled people to create metal objects which were superior to those previoulsy possible because of its strength and hardness, and it has been used throughout the world for weapons, coins, tools, statuary and other decorative items.
It is very fluid in a molten state, and its hardness, strength when set, and non-corrosive properties makes it most suitable for casting sculpture.
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